Do you want to support Aegisub? Well, it's easy!
You can give us feedback - comments, critiques, suggestions, etc. Bug reports and feature requests are always welcome. Check out our forums and the bug tracker, or stop by for a chat in the IRC channel.
Like Aegisub? Tell your friends about it! Spreading the word is a good way of helping Aegisub to be the best subtitle editor around.
Feeling generous? Consider giving us a donation! We do this in our spare time, you know.
"Given enough eyes, all bugs are shallow."
– Linus Torvalds
Feel like really helping out, or do you just have some code you want to donate? Some advice from readme.txt in the source tree:
First, some of the code is pretty readable, some is decent, and some is patched up crap. Good luck. ;)
Before coding up a new feature you should probably hop on IRC and check with a developer to verify that we agree it's a feature that Aegisub should have, or you run the risk of wasting some work. Unsolicited bug fixes are usually welcome, though.
Second, if you want to code anything for Aegisub, you will need to agree to these terms:
Third, this is all available under the BSD license. According to GNU itself, BSD is GPL-compatible, meaning that you can link GPL code to BSD code. Keep in mind, though, that if a source file has mixed BSD and GPL content, it becomes ruled by GPL.