t features such cool gimmicks like alpha transparency, nuvola icons and other stuff (look at the screenshots).

As the name suggests, this little program lets you change your gtk+ 2.0 theme. The aim is to make theme preview and selection as slick as possible. Themes installed on the system are presented for selection and previewed on the fly. For a comprehensive demonstration there's a large variety of...

Encfs creates transparent and overlaid encryption over any pre-existing filesystem. A perfectly normal directory in your filesystem looks like garbage, but when you mount it, upon providing password, you can read and write it un-obfuscatedly.
For first time creation there is a helpful...

Cross Platform Password Manager

Nmap ("Network Mapper") is a console utility for network exploration or security auditing. Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel

Scientific Computation System

an implementation of Common Lisp

library helps programmers to write extensions or plugins. Needed by TeXmacs

SymPy is a Python library for symbolic mathematics

A set of routines for solving unsymmetric sparse linear systems, Ax=b, using the Unsymmetric MultiFrontal method.