Here are some of the open source projects that I've started in the past. Unfortunately I don't have that much time to work on them at the moment (with the possible exception of the Matlab functions as I use them in my day job).
If you want to contact me about any of these projects, you can email me at firstname.lastname@example.org.
DCPcrypt is a library of cryptographic functions for the Delphi programming language (it has, at various points in time, worked with the Free Pascal Compiler as well). The code base for this project hasn't really changed very much for quite a long time as I no longer use Delphi since I mostly work under Linux. (Though I still like Delphi as it was a very nice tool/language.)
pdf2svg is a neat little program that converges a (page of a) PDF file into a Scalable Vector Graphics file which can be opened by Inkscape. It's nothing more than a simple wrapper over the top of Poppler and Cairo.
confluence-mathjax is a thin wrapper around MathJax so it can be used as a plugin with Atlassian Confluence. This means you can have nice looking mathematics (written with Latex notation) in your wiki!
Matlab functions contains many of the m-files that I use in my day-to-day job as a university researcher in mathematics. They may or may not be useful!
A side note for those of you who use Matlab under Linux: you may experience problems with Matlab and the latest version of Fedora Linux due to problems with IBus and Java (more specifically, the keyboard stops working in Matlab!). One way to get around this is disable IBus (Gnome Settings → Input Method → No Input Method). See Matlab Central for more details.
If you find any of my (rather limited) open source work useful, please consider making a donation. These donations (mostly) go towards keeping up my supply of books to read.
You can make donations via Paypal to the Paypal address email@example.com or by clicking the Donate button.
Alternatively, if you can buy me a gift from my wish list at Amazon.co.uk. Thanks!