Too Long; Didn't Read
There are hundreds of developer conferences covering everything you could think of in our industry. But finding out which are coming up and have an open call for proposals (CFP) is the challenge. The following list includes websites, mailing lists and Twitter accounts that share developer conferences and their CFPs. CFP Land is the most comprehensive website and mailing list full of developer CFPS that I know today. SeeCFP has a Twitter account, RSS feed and even a CFP API. PaperCall is a site on which you can host your conference's CFP so naturally it has a list of currently open CFP.