Multiverse
A post was made today in the IPFS discussion forums about a project aiming to be a decentralized replacement for GitHub called Multiverse. It is currently alpha software, so only try to use it if you are intending to submit bug reports, becoming a developer, or being a bleeding edge adopter. It is far from ready for mainstream developer use. But is is already promising, to the point that if it stays maintained, I will be switching my repositories over to it.
The source code is currently hosted here at GitHub. If you want to take a look at a repo, try here.