If your plugins are open source, you should get devcoins. To get them you must make a project page and/or a discussion thread where you discuss your accomplishments. On the share list:
https://raw.github.com/Unthinkingbit/charity/master/bitcoinshare.htmleveryone has a link to their project, and/or discussion thread.
If a developer actively develops open source of any kind, they can apply to get a share of devcoin generation by messaging Metazilla through the bitcoin forum, or by posting in the devcoin thread
I wrote that a long time ago, when the thread had few posts. Because this thread is now busy, in future people should only contact Metazilla; I'll remove the part about posting in the devcoin thread. Since that is what the page said, it's no problem that you posted here, and indeed if you want to talk about devcoin, post here again.