Tell me please, is this version obsolete? https://github.com/coinbin/coinbin
Does this version have a relationship to official repotory?

No commits since 2014, A beta version and it says it was made by OutCast3k.

It's possible that it was by OP and then he changed the repository because apparently, the first version released on the new repository is 1.1 while the link you're referring to is 1.0.

I don't see why you would use something unstable and that might have bugs though. So If you're planning to do that, make sure to check the source code and not just run it as well, just to be sure that it doesn't contain anything malicious.

My conclusion came based on two things:

1. The current repository has version 1.1 as the first release which means that 1.0 might have been somewhere else (in the link you gave).

2. Whoever posted that release wanted to give credit to OutCast3k. I don't this is likely because coinb.in was not famous back then, so someone hosting something for phishing people is unlikely.

Either way though, I wouldn't suggest using it even If it was from the original creator, because it might contain a lot of bugs.