Beaver is an Early AdVanced EditoR, for Linux and other Unices (and even Windows); in other words, it's a text editor that is intended to be light-weight, but full of useful features for programming, from editing of web sites to C coding. It is based upon the GTK+ toolkit, supports many languages through config files and offers functions such as automatic indentation and completion or syntax highlighting. In fact, it is 100% compatible with Ultraedit's wordfile.txt files, and has its own mini macro language.
WWW: http://beaver-editor.sourceforge.net/