http://contest.i2p is an i2p-only programming contest. The goal is to be to bring more developers into i2p.
There's an XMR reward for winning. The last i knew, contest.i2p was funded with 0.5XMR to start from http://village.i2p, and they accept donations to increase the prize pool http://contest.i2p/donate.xhtml.
10% of the prize pool will be donated to stormycloud. The java team doesn't accept donations and isn't a legal entity that can accept them, but stormycloud is, and runs a lot of infrastructure in i2p.
Check them out and go win some XMR. You can enter the contest by registering http://contest.i2p/new-register?action=209&contest_id=2 and joining the trial round.