e3 is a full-screen, user-friendly text editor with an interface similar to that of either WordStar, Emacs, Pico, Nedit, or vi. It's heavily optimized for size and independent of libc or any other libraries, making it useful for mini-Linux distributions and rescue disks. The assembler version supports Linux, FreeBSD, OpenBSD, NetBSD, Win9x, QNX, Atheos, BeOS, ELKS, and DOS. There is also a separately distributed version written in C which supports some other Unix versions and CygWin. It is also possible to use regular expressions by using child processes like sed. e3 has a built in arithmetic calculator.
Minimum Profit (mp) is a programmer's text editor. It features small memory and disk requirements, syntax highlighting, context-sensitive help for the source code being edited, multiple simultaneous file editing, ctags support, word wrapping, and more. It can be compiled for Qt, Ncurses, GTK, and MS Windows.
xvnkb is a Vietnamese keyboard input program for X Windows. It provides a useful way of editing Vietnamese in X Windows environments with popular input methods and charsets. It runs as a small X application in the background without any interference with others, and works well with most X applications. Supported Vietnamese input methods include VNI, TELEX, and VIQR. Supported Vietnamese charsets include TCVN3, VISCII, VPS, VNI, VIQR, and Unicode (UTF-8).