GCC, the GNU Compiler Collection, includes front ends for C, C++, Objective-C, Fortran, Java, Ada, and Go, as well as libraries for these languages (libstdc++, libgcj,...).

Eclipse is an open source community whose projects are focused on providing an extensible development platform and application frameworks for building software. The Eclipse Platform is written in the Java language and comes with extensive plug-in construction toolkits and examples.

Bluefish is a powerful editor for web designers and programmers working in Linux or Mac OS X. It supports many programming and markup languages, but it focuses on editing dynamic and interactive websites.

KompoZer is a complete WYSIWYG (what-you-see-is-what-you-get) web authoring system for Linux, Windows and Macintosh. No technical expertise or knowledge of HTML is necessary to create web pages.

LaTeX is a high-quality typesetting system used for creating most scientific documents worldwide. In order to start using LaTeX you will need to install one of the LaTeX distributions available, as well as a text editor of your choice (the ones presented on this page are especially useful for editing LaTeX).