Terminal.app is a terminal emulator for GNUstep (http://www.gnustep.org) and other applications as a part of the Free Software projects released under GPL.
Book on Linux x86 assembly language programming which is available both in print and online under the GFDL license. Targetted to both new programmers and professional programmers who have not yet learned assembly language.
Language made mainly for complex processing of text in SGML-like formats. Key feature: notion of finite-state automata used to define text transformations. Also made for Web programming, with inherent CGI abilities. Project page. [Savannah]