I currently work at a major investment bank developing front office trading and risk systems. Prior to that I worked at a financial software house as a technical consultant, team leading Linux C/C++, Java J2EE, CORBA and Database development of front office trading systems.
If you need to shift the date or time on a Linux or Unix machine you may be interested in dateshift, my date/time testing tool for Linux and Solaris.
I have also written ssltunnel.pl , a firewall tunnelling script for accessing external network resources through a normal web proxy. You can use this to access SSH, CVS hosts and many other TCP/IP based services from behind a firewall.
You can find out more about my involvement with free software.
My third year project whilst at the University of Warwick was an Atari 2600 emulator, which I released as open source. I no longer develop it due to lack of time, so to play 2600 games I recommed Stella, as it is faster and supports more games.
For historical interest or if you are looking for a pure C 2600 emulator to port, check out the Virtual 2600 Home Page .
You may like to try the games I have written. Be warned that they are fairly old....: