How many projects(within the same organisation) can one apply for in GSoC (google summer of code)?
For the Google Summer of Code I would interpret their student advice from the FAQ to imply that you can apply to as many projects as you like, but can only be accepted in one. It doesn't seem to be the number of organizations, but the number of projects.
Caveat. I don't make the rules. But given that Google is pretty experienced in such things, I'd guess that if you apply to more than you should, that the system will kick out the extras.