COMmon Algorithmic Language, created in 1980s to teach structured programming, mixes BASIC and Pascal minus problems of each. Interpreted, portable; runs on DOS, Unix, Windows. Description, documents, history, download, links. [Open Source, GPL]

Brief description, screen shot, links.

An exTENSIbLE programming language intended mainly to process text documents in various input formats and languages. Core uses only features from ISO C + POSIX library functions. Was NSL. [Open source, GPL]

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]

Brief description, links, information, downloads. [freshmeat.net]

Ancient, very good, general purpose macro processor. First written in DEC PDP-7 assembly language by Peter J. Brown. Description, history, code samples, contact, downloads: binary, source. [Open Source, GPL]