Project: Keylogger Creator
I learned Javascript and Java while in universitty. During my research I had also discovered that Java used a sandbox to isolate its running environment (virtual machine).
I wanted to try and build something that could work outside of this restriction, so I decided to create a keylogger creation system.
I created the keylogger in C#, and it had some pretty complex road-blocks to figure out. Overall it was a great way to learn persistance and required quite a few nights of solving issues.
I never released the code - I didn't want people I knew getting up to mischief!