I have writen a couple of Perl modules, available on CPAN under various open-source licences. The main ones are:
And some older stuff, not maintained:
- Profil is an http proxy writen in java. Its main purpose is to filter on the fly your http traffic in order to anonymize it or block unwanted content. Little more than a proof of concept. Writen in 2000.
- An implementation of RSA in java. Encrypt and decrypt files (very slowly). Contains an implementation of some mathematic operations on large (prime) numbers.