The 'real' Github clone in China is called gitcafe, available at: https://gitcafe.com

I have been involved with the community for many years... and therefore I do not completely agree with your statement: "there are not enough open source projects and contributors in China". We have them, and they generally contribute directly to the projects involved (as it should be as you do not want to create islands/insular projects). Local (and localized) initiatives are great and I hope this is what you meant.