A programmer's editor, written entirely in Ruby and thus easy to extend with Ruby customizations. Summary of the features, developers weblog, information about the development and download and installation instructions.
A text editor for X-window (UNIX only) , with a built-in C/C++/Java code browser and a C interpreter. Beside a screenshots and a features sections there is a download area and a page with instructions to build from the source.
Disk editor for Linux, originally written to help recover deleted files. It has a simple ncurses interface that resembles an old version of Norton Disk Edit for DOS.
Editor based on the VM/CMS editor XEDIT, using REXX as its macro language. Available for UNIX (including Linux) as text and X11 variants, OS/2, Windows, BeOS, QNX and Amiga.