You can clone with
HTTPS or Subversion.
I know you say not contribute snippet...
But, nowaday, I cannot see any binding snippet. It so unfortunately.
It so useful, especially when Create some new snippet.
Select some region, and wrap a suitable wrapper, It is the rightest thing
to use binding snippet, You say ??
I'm not sure I follow. Are you saying snippets for snippet-mode? Why don't you make a fork and open a pull request, then I'll have a better idea of what you mean.
If however you know ruby and want to contribute to the other modes, consider reading and extending extras/textmate-import.rb. It's what I want to do next after I fill all the bugs you reported :-)
Anyway, as I said, fork yasnippet and open a pull request.
Closing. Yasnippet repository no longer has snippets, consider submitting to https://github.com/AndreaCrotti/yasnippet-snippets instead.