Workrave is a program that assists in the recovery and prevention of Repetitive Strain Injury (RSI). The program frequently alerts you to take micro-pauses, rest breaks and restricts you to your daily limit.

Le Biniou works with music, voice, ambient sounds, whatever acoustic source you choose.

Mercurial is a fast, lightweight Source Control Management system designed for efficient handling of very large distributed projects.

Kgpg manages cryptographic keys for the GNU Privacy Guard, and can encrypt, decrypt, sign, and verify files. It features a simple editor for applying cryptography to short pieces of text, and can also quickly apply cryptography to the contents of the clipboard.

SecPanel is a graphical user interface for managining and running secure shell (ssh) and secure network copy (scp) connections via OpenSSH. It eases key distribution and other tasks related to using these programs.

Maxima is a fully symbolic computation program. It is full featured doing symbolic manipulation of polynomials, matrices, rational functions, integration, Todd-coxeter methods for finite group analysis, graphing, multiple precision floating point computation. It has a symbolic source level debugger for maxima code. Maxima is based on the original Macsyma developed at MIT in the 1970s. It is quite reliable, and has good garbage collection, and no memory leaks. It comes with hundreds of self tests.