I've got yet another question whether Weblate has any sort for ACL to limit access to project. As usual, my answer was no, but I started to think how I would implement such feature.
After a little bit of thinking and playing with code, I've realized, that this is not that hard as I thought and implemented it in few minutes. So there is another ofter requested feature which will come in Weblate 1.4 - ACL.
It provides simple way to limit access to some projects to some users. The default behavior is still that anybody logged in can do anything, but this can be changed per project by enabling ACL for it. More details are available in our documentation.