The KDE Simple Programming tutorial teaches how to develop a KDE application. With the only requirement of a little C++ knowledge, and using the latest KDE snapshots, the reader will learn how to build his/her first KDE application from a simple "Hello world" button to a Web browser with a DCOP interface that communicates with a bookmark application running in a separate process. There's also a spanish version of the documentation.
help2man is a tool for automatically generating simple manual pages from program output. It is intended to provide an easy way for software authors to include a manual page in their distribution without having to maintain that document. Given a program which produces reasonably standard --help and --version outputs, help2man will attempt to re-arrange that output into something which resembles a manual page.
GNU TeXmacs is a free wysiwyw (what you see is what you want) editing platform with special features for scientists. The software aims to provide a unified and user friendly framework for editing structured documents with different types of content: text, mathematics, graphics, interactive content. TeXmacs can also be used as an interface to many external systems for computer algebra, numerical analysis, and statistics. New presentation styles can be written by the user and new features can be added to the editor using Scheme.