I don't think there is one released currently. I was working on one with @smh, I ripped the original website and was coding PHP into it, got to the liking ability to user comments then gave up because it was a pointless project, there is already like three Snog websites, so why re-create another.
The current version is built with Laravel and other miscellaneous frameworks.
There is no open source to it, the older outdated version is so out of time it doesn't have tagging and is super slow.