From .:Rapidleech Wiki:.
You want to participate the development of Rapidleech? This page should give you a little bit of introduction on how to start.
If you don't know how to start
There's an excellent PHP tutorial for absolute beginners at the Zend Developers' Zone.
Try to fix plugins
Plugins is the easiest portion of code in Rapidleech. There are some tutorial on how to write but if you still don't understand, you might want to start by try fixing broken ones.
Implement New Things
You can try to implement new features or anything to make Rapidleech even usable. You can submit your mods in a way that everyone can understand like this.
Other things you can do
The wiki has just been started, it's far from complete. You can help out by writing articles and linking them together to provide useful information to new users. Just make sure the documentation doesn't exist yet.