(Qt)-Backstep.py is commandline and graphical (Qt) backup software written in pure Python. It can back up any directory to CD-R(W), DVD-R(W), USB key, or another directory. It is a continuous backup solution. It works like a time machine. It contains a backup network server. It can send backups over the Internet or your network.
The Ruby Crypt library is a Ruby implementation of a number of popular encryption algorithms. Block cyphers currently available include Blowfish, GOST, IDEA, and Rijndael (AES). Cypher Block Chaining (CBC) has been implemented. Twofish, Serpent, and CAST256 are planned for release soon. It is written entirely in Ruby so deployment is simple: no platform concerns, no library dependencies, and nothing to compile.
Lithos is an evolutionary computation system using a computationally complete stack-based representation language. The sample application evolves programs to play the game of Go. The system can be applied to other areas by plugging in a different evaluation function. ANSI C source code is provided.