ArgoUML is the leading open source UML modeling tool and includes support for all standard UML 1.4 diagrams. It runs on any Java platform and is available in ten languages. See the feature list for more details.
Backdrop CMS is a Drupal fork with a focus on features, performance, and usability. Backdrop puts the needs of the small to medium sized businesses and non-profits first. Backdrop contains more of the features this audience wants—and fewer they don’t—to ensure they can still afford a fantastic Open Source Content Management System.
The Bongo Project is creating fun and simple mail, calendaring and contacts software: on top of a standards-based server stack; we're innovating fresh and interesting web user interfaces for managing personal communications. Bongo is providing an entirely free software solution which is less concerned with the corporate mail scenario and much more focused on how people want to organize their lives.
Boost provides free peer-reviewed portable C++ source libraries.
Boost emphasizes libraries that work well with the C++ Standard Library. Boost libraries are intended to be widely useful, and usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use.
Boost aims to establish “existing practice” and provide reference implementations so that Boost libraries are suitable for eventual standardization. Ten Boost libraries are already included in the C++ Standards Committee's Library Technical Report (TR1) as a step toward becoming part of a future C++ Standard. More Boost libraries are proposed for the upcoming TR2.
Buildbot is a freely-licensed framework which enables software developers to automate software build, test, and release processes for their software projects. First released in 2003, Buildbot is used by leading software projects around the world to automate all aspects of their software development cycle.
BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides replacements for most of the utilities you usually find in GNU fileutils, shellutils, etc. The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts. BusyBox provides a fairly complete environment for any small or embedded system.
BusyBox has been written with size-optimization and limited resources in mind. It is also extremely modular so you can easily include or exclude commands (or features) at compile time. This makes it easy to customize your embedded systems. To create a working system, just add some device nodes in /dev, a few configuration files in /etc, and a Linux kernel.
Clojars is a community-maintained repository for free and open source libraries written in the Clojure programming language. Clojars emphasizes ease of use, publishing library packages that are simple to use with build automation tools.
The Common Workflow Language (CWL) is a specification for describing analysis workflows and tools in a way that makes them portable and scalable across a variety of software and hardware environments, from workstations to cluster, cloud, and high performance computing (HPC) environments. CWL is designed to meet the needs of data-intensive science, such as bioinformatics, medical imaging, astronomy, physics, and chemistry.
coreboot is an extended firmware platform that delivers lightning fast secure boot on modern computers and embedded systems. As an open source project it provides auditability and maximum control over the computers that run it. It is industrial-strength firmware that secures more 30 million shipped devices, including personal computers, headless servers, tablets, and Internet of Things devices.
Darcs is a distributed revision control system written in Haskell. In Darcs, every copy of your source code is a full repository, which allows for full operation in a disconnected environment, and also allows anyone with read access to a Darcs repository to easily create their own branch and modify it with the full power of Darcs' revision control. Darcs is based on an underlying theory of patches, which allows for safe reordering and merging of patches even in complex scenarios. For all its power, Darcs remains a very easy to use tool for every day use because it follows the principle of keeping simple things simple. Darcs is free software licensed under the GNU GPL.
The Debian Copyright Aggregation Project offers contributors to the Debian project the optional opportunity, regarding their works contributed to Debian, to assign copyrights or sign a license enforcement agreement (which delegates to Conservancy the authority of license enforcement). The Project also creates an ongoing relationship between Conservancy and Debian, wherein Conservancy offers Debian its expertise and advice on software licensing, enforcement, and related issues.
Etherpad is is a highly customizable web-based editor providing collaborative real-time editing.
The Evergreen Project develops an open source ILS (integrated library system) used by hundreds of libraries across the world. The software, also called Evergreen, is used by libraries to provide their public catalog interface as well as to manage back-of-house operations such as circulation (checkouts and checkins), acquisition and cataloging of library materials, and sharing resources among groups of libraries and consortia on the same Evergreen system. Evergreen is designed to be scalable and supports library operations ranging from a small high school to large state-wide consortia. Evergreen is released under the GPLv2-or-later.
Gevent is a fast, coroutine-based networking library for Python. Gevent is used in network applications, including servers that scale up to tens thousands of connections but without the complexity usually associated with event-driven architecture.
Gevent provides light-weight “green” threads with a similar interface as the standard “threading” and “multiprocessing” packages. The library includes a DNS resolver, a WSGI server, a monkey patching utility to make 3rd party protocol implementations cooperative and support for SSL sockets.
Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
Every Git clone is a full-fledged repository with complete history and full revision tracking capabilities, not dependent on network access or a central server. Branching and merging are fast and easy to do.
Git is used for version control of files, much like tools such as Mercurial, Bazaar, Subversion, CVS, Perforce, and Visual SourceSafe.
Godot is an advanced, feature packed, multi-platform 2D and 3D game engine. It provides a huge set of common tools, so you can just focus on making your game without reinventing the wheel. Godot is is completely Free and Open Source under the MIT License.
The GPL Compliance Project for Linux Developers is comprised of copyright holders in the kernel, Linux, who have contributed to Linux under its license, the GPLv2. These copyright holders have formally asked Conservancy to engage in compliance efforts for their copyrights in the Linux kernel.
Harvey is a new operating system. It’s most directly descended from Plan 9, the research operating system developed at Bell Labs as a successor to Unix. This influence spans from its distributed application architecture all the way down to much of its code. However, Harvey aims to be a more practical, general-purpose operating system, so it also uses ideas and code from other systems.
Harvey strives to provide an accessible development environment. The kernel is compact—less than 100,000 lines of code. You can build it with either GCC or LLVM, and run it under QEMU or real hardware. This makes it especially suitable for education and experimentation. It is a work in progress and the development team welcomes new contributors and ideas.
Homebrew is a software package manager for Apple's OS X operating system. Homebrew installs the free and open source software that OS X users need that Apple didn't install by default.
Houdini is an all-in-one fundraising platform developed in Ruby on Rails. It’s licensed under AGPL/LGPL and is available, without cost, to anyone in the world. We help nonprofits, people, and movements thrive and maintain themselves.
Inkscape is an Open Source vector graphics editor, with capabilities similar to Illustrator, Freehand, CorelDraw, or Xara X using the open-standard Scalable Vector Graphics (SVG) file format. Inkscape's main goal is to create a powerful and convenient drawing tool fully compliant with XML, SVG, and CSS standards.
In contrast to raster (bitmap) graphics editors such as Photoshop or Gimp, Inkscape stores its graphics in a vector format. Vector graphics is a resolution-independent description of the actual shapes and objects that you see in the image. This description is then used to determine how to plot each line and curve at any resolution or zoom level.
K-3D is the free-as-in-freedom 3D modeling, animation, and rendering system for GNU/Linux, MacOSX, and Windows operating systems. K-3D is based on a powerful Visualization Pipeline that enables procedural modeling and a robust plugin architecture, and is designed to scale to the needs of professional artists.
Kallithea is a free software source code management system supporting two leading version control systems, Mercurial and Git. Kallithea hosts your code, manages access control lists and provides an easy web interface to the version control system of your choice.
LibreHealth is the foundation of a worldwide ecosystem of free and open source Health IT innovation, and is a place where people can come together to build tools that enhance the quality of healthcare around the world. LibreHealth projects currently include: LibreHealth Toolkit, a foundational base for building Health IT tools; LibreHealth EHR, an electronic health record derived from best practices and technology from leading open source systems; and LibreHealth Radiology, a specialized distribution of Toolkit customized for radiology health care professionals.
Linux XIA is a new protocol stack for Linux built using eXpress Internet Architecture (XIA), an interoperable meta network architecture. Linux XIA is designed to meet unfulfilled demands of real-world networking. The project's roadmap includes the development of a DDoS protection system, and the addition of state-of-the-art algorithms and data structures to increase Linux XIA's speed and flexibility.
Mercurial is a fast, lightweight Source Control Management system which can track revisions to software during development. Since its conception in April 2005, Mercurial has been adopted by many projects for revision control, including Xen, One Laptop Per Child, and the Advanced Linux Sound Architecture (ALSA). Mercurial runs on Unix-like systems, Mac OS X, and Windows computers, and it is licensed under the GNU General Public License.
Metalink is dedicated to improving downloads. Metalink makes it much easier for people — especially those in areas with inferior Internet connections — to download Open Source and Free Software. Metalink increases the effectiveness and efficiency of downloads by combining the speed, bandwidth distribution, and redundancy of an optimized hybrid mirror/peer-to-peer network, without any questions of legality, integrity, or safety.
MicroBlocks is a new programming language that runs right inside microcontroller boards such as the micro:bit, the NodeMCU and many Arduino boards. The MicroBlocks system allows for dynamic, parallel and interactive programming, but with the twist of letting your projects run autonomously inside the board without being tethered to a computer.
North Bay Python is a community-organized conference in Petaluma, California that brings together professionals, enthusiasts, and students interested in the Python programming language.
OpenTripPlanner is the leading open source platform for multimodal trip itinerary planning and network analysis. Launched in 2009, OpenTripPlanner has since attracted a thriving community of users and developers, with live deployments now found in twelve countries. OpenTripPlanner provides a multimodal trip planner allowing users to plan trips using a variety of transportation modes. Additionally, OpenTripPlanner has features for transportation analysis, including measures of mobility and accessibility.
Outreachy helps people from groups underrepresented in free and open source software get involved by providing a supportive community for newcomers to contribute to throughout the year, and by offering focused internship opportunities twice a year with many free software organizations.
phpMyAdmin is a free and open source web interface for the MySQL and MariaDB database systems. Frequently used operations (managing databases, tables, columns, relations, indexes, users, permissions, etc) can be performed via the user interface, while you still have the ability to directly execute any SQL statement.
Since its first release in September 1998, phpMyAdmin has been adopted by many web host providers, and has translations underway for more than seventy languages.
QEMU is a generic and open source machine emulator and virtualizer. When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an ARM board) on a different machine (e.g. your own PC). By using dynamic translation, it achieves very good performance. When used as a virtualizer, QEMU achieves near native performances by executing the guest code directly on the host CPU. QEMU supports virtualization when executing under the Xen hypervisor or using the KVM kernel module in Linux. When using KVM, QEMU can virtualize x86, server and embedded PowerPC, and S390 guests.
Racket is a general-purpose programming language as well as the world’s first ecosystem for language-oriented programming. Make your dream language, or use one of the dozens already available.
Reproducible Builds are a set of software development practices that create an independently verifiable path from source code to the binary code used by computers. This is especially useful for developers collaborating on privacy or security software employed by politically sensitive targets such as dissidents, journalists and whistleblowers, or anyone wishing to communicate securely under a repressive regime.
Samba is a FOSS suite that provides seamless file and print services to SMB/CIFS clients, namely, to Microsoft Windows. Samba is freely available, unlike other SMB/CIFS implementations, and allows for interoperability between Linux/Unix servers and Windows-based clients. Samba is software that can be run on a platform other than Microsoft Windows. For example, Samba runs on Unix, GNU/Linux, IBM System z, Solaris, Mac OS X, and OpenVMS, among others. It is standard on virtually all distributions of GNU/Linux and is commonly included as a basic system service on other UNIX-based systems as well. Samba uses the TCP/IP protocol that is installed on the host server.
One of the key goals of the project is to remove barriers to interoperability. Samba is a software package that gives network administrators flexibility and freedom in setup, configuration, choice of systems, and equipment. Samba is released under the GPL.
Selenium is a suite of tools for browser automation. It is composed of “IDE”, a recording and playback mechanism, “WebDriver” and “RC” which provide APIs for browser automation in a wide variety of languages, and “Grid”, which allows many tests using the APIs to be run in parallel. It works with most browsers, including Firefox, Internet Explorer, Google Chrome, Safari and Opera.
Spec-Ops' mission is to identify critical open standards activities and move them along. Spec-Ops puts experts in the room who understand the technology, who know about the process of creating standards, and who have no specific personal or corporate agenda — then lets them get on with it. Spec-Ops also develops free and open source software (licensed under BSD-style licenses) to test and implement these standards, in order to speed adoption and ensure their long term viability and success.
Squeak is a modern, open source, full-featured implementation of the powerful Smalltalk programming language and environment. Squeak is highly-portable - even its virtual machine is written entirely in Smalltalk making it easy to debug, analyze, and change. Squeak is the vehicle for a wide range of projects from multimedia applications, educational platforms to commercial web application development.
Sugar is a learning platform that reinvents how computers are used for education. Sugar's focus on sharing, criticism, and exploration is grounded in the culture of free software. Sugar Labs' mission is to produce, distribute and support the use of the Sugar learning platform. Sugar Labs supports the community of educators and software developers who want to extend the platform. Sugar is a community project: under the Sugar Labs umbrella hundreds of software developers and thousands of educators work together to build, disseminate, and support Sugar.
The Survey Open Source (SurveyOS) Project is a non-profit project of the Software Freedom Conservancy dedicated to fostering cooperation between land surveyors and GIS professionals through the development of open source software and open technology standards. The SurveyOS Project currently devotes programming efforts and source code to the open source desktop GIS program known as OpenJUMP. It also dedicates a set of AutoLISP source code via the GPL that can be used to add surveying and geospatial functionality to other software.
SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages. SWIG is used with different types of languages including common scripting languages such as Perl, PHP, Python, Tcl and Ruby. The list of supported languages also includes C#, Java, Lua, Octave and R amongst others. SWIG is most commonly used to create high-level interpreted or compiled programming environments, user interfaces, and as a tool for testing and prototyping C/C++ software.
Teaching Open Source (TOS) exists to support instructors and FLOSS community members who desire to support student involvement in FLOSS projects within academic institutions. The TOS community is supported by a web site, mailing list, and planet and welcomes new community members from both academia and FLOSS projects.
Twisted is an event-based engine for Internet applications, written in Python. Twisted supports TCP, SSL and TLS, UDP, Unix sockets, multicast, and serial ports. It also includes a Web server, an SMTP/POP3 server, a telnet server, an SSH server, an IRC server, a DNS server, and of course APIs for creating new protocols. It supports integration with GTK+ 2, Qt, Tkinter, wxPython, Mac OS X (PyObjC) and Win32 event loops.
Wine is an Open Source implementation of the Windows API on top of X and Unix. It is a compatibility layer for running Windows programs. Wine does not require Microsoft Windows, as it is a completely free alternative implementation of the Windows API consisting of 100% non-Microsoft code, however Wine can optionally use native Windows DLLs if they are available. Wine provides both a development toolkit for porting Windows source code to Unix as well as a program loader, allowing many unmodified Windows programs to run on x86-based Unixes, including Linux, Mac OS X, FreeBSD, and Solaris.
Xapian is a highly adaptable toolkit which allows developers to easily add advanced indexing and search facilities to their own applications. It has built-in support for several families of weighting models and also supports a rich set of boolean query operators.