Many amateurs make valuable contributions in the field of computer programming through the open source movement.

Category: Free and open source software organizations

* Adobe Source Libraries, a set of open source software libraries by Adobe

He is known for his analysis of complex proprietary protocols and algorithms, to allow compatible free and open source software implementations.

The Artistic License refers most commonly to the original Artistic License ( version 1. 0 ), a software license used for certain free and open source software packages, most notably the standard Perl implementation and most CPAN modules, which are dual-licensed under the Artistic License and the GNU General Public License ( GPL ).

However, this left undisturbed the finding that a free and open source license nonetheless has economic value.

* ABC ( Yet Another BitTorrent Client ), a free software, open source BitTorrent client based on BitTornado

* mpc-Musepack or MPC ( formerly known as MPEGplus, MPEG + or MP +) is an open source lossy audio codec, specifically optimized for transparent compression of stereo audio at bitrates of 160 – 180 kbit / s.

* ogg – a free, open source container format supporting a variety of formats, the most popular of which is the audio format Vorbis.

AbiWord had grammar checking before any other open source word processor, although a grammar checker was later added to OpenOffice. org.

Link Grammar is both a theory of syntax and an open source parser which is now developed by the AbiWord project.

ArgoUML is an UML diagramming application written in Java and released under the open source Eclipse Public License.

It is now an open source project hosted by Tigris. org.

* Alvyn Basic — An attempt to recreate an open source multiplatform BASIC interpreter, syntax-compatible with AMOS Professional.

InterBase 6. 0 was made available as an open source product in July 2000.

Borland stopped open source releases of InterBase and has developed and sold new versions at a fast pace.

Berkeley DB is redistributed under the Sleepycat Public License, which is an OSI-approved open source license as well as an FSF-approved free software licence.

The code quality and general utility along with the licensing terms have led to its use in a multitude of free and open source software.

Berkeley DB provides the underlying storage and retrieval system of several LDAP servers, database systems, and many other proprietary and free / open source applications.

* ARC-Advanced Resource Connector open source grid middleware introduced by NorduGrid, use BerkeleyDB in several services.

* Asterisk PBX-A free / open source PBX.

* Bitcoin-A distributed peer-to-peer open source digital currency.

* Bogofilter – A free / open source spam filter that saves its wordlists using Berkeley DB.

* Carbonado – An open source relational database access layer.

* Citadel – A free / open source groupware platform that keeps all of its data stores, including the message base, in Berkeley DB.

* OpenCOBOL-A free / open source COBOL implementation.

* OpenLDAP – A free / open source implementation of the Lightweight Directory Access Protocol ( LDAP )

* Mono development platform is an open source implementation of CLI and accompanying technologies, sponsored by Xamarin.

The implementation was open sourced at the end of the year.

Four other open source implementations are available: " The Eiffel Compiler " tecomp, Gobo Eiffel, SmartEiffel — the GNU implementation, based on an older version of the language — and Visual Eiffel.

The Haskell language began with a consensus in 1987 to form an open standard for functional programming research ; implementation releases have been ongoing since 1990.

* http :// www. opencores. org The OpenCores website contains open source floating point IP cores for the implementation of floating point operators in FPGA or ASIC devices.

A leading authority, and the author of an open source MUMPS implementation, Professor Kevin O ' Kane, uses only ' MUMPS '.

Mesa 3D is a free / open source implementation of OpenGL.

CPython, the reference implementation of Python, is free and open source software and has a community-based development model, as do nearly all of its alternative implementations.

Squeak is an open source implementation derived from Smalltalk-80 Version 1 by way of Apple Smalltalk.

The open Squeak implementation has an active community of developers, including many of the original Smalltalk community, and has recently been used to provide the Etoys environment on the OLPC project, a toolkit for developing collaborative applications Croquet Project, and the Open Cobalt virtual world application.

The description published by Landin was fairly abstract, and left many implementation choices open ( like an operational semantics ).

Macro SNOBOL4 in C written by Phil Budne is a free, open source implementation, capable of running on almost any platform.

It is fully backwards compatible with the non open source implementation.

The Xiph. Org Foundation's reference implementation is free and open sourced and it is dual-licensed under the BSD License and the GNU Lesser General Public License ( LGPL ).

The X. Org Foundation leads the X project, with the current reference implementation, X. Org Server, available as free and open source software under the MIT License and similar permissive licenses.

Commercial Unix vendors have tended to take the open source implementation and adapt it for their hardware, usually customizing it and adding proprietary extensions.

The Android X Server is an open source Java implementation that runs on Android devices.

To implement Metaphone without purchasing an open source copy of Metaphone 3, the best guide would be the reference implementation of Double Metaphone, which may be found here.

The licensing restrictions on CSS make it impossible to create an open source implementation through official channels, and closed source drivers are unavailable for some operating systems, so some users need DeCSS to watch movies.

This is not a problem if the product's implementation is open and minimally encumbered, but it may as well be both closed and heavily encumbered ( e. g. by patent claims ).

MicroEmulator provides an open source ( LGPL ) implementation of MIDP emulator.

* Woodstox – An open source StAX and SAX ( as of version 3. 2 ) implementation.