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Richard Stallman
Description
Richard Matthew Stallman, often known by his initials, RMS, is an American software freedom activist and computer programmer. He campaigns for the freedom to use, study, distribute and modify software; software that ensures these freedoms is termed free software. He is best known for launching the GNU Project, founding the Free Software Foundation, developing the GNU Compiler Collection and GNU Emacs, and writing the GNU General Public License.
Stallman launched the GNU Project in September 1983 to create a Unix-like computer operating system composed entirely of free software. With this, he also launched the free software movement. He has been the GNU project's lead architect and organizer, and developed a number of pieces of widely used GNU software including, among others, the GNU Compiler Collection, the GNU Debugger and the GNU Emacs text editor. In October 1985 he founded the Free Software Foundation.
Stallman pioneered the concept of copyleft, which uses the principles of copyright law to preserve the right to use, modify and distribute free software, and is the main author of free software licenses which describe those terms, most notably the GNU General Public License, the most widely used free software license.
(via Freebase)