From original thread.

Both aima-javascript and aima-exercises seems related to web development, although I understand that aima-javascript focuses more on the algorithm animation. Can someone suggest me if I could show interest in both in my proposal? Since the mentors are different does that require me to submit two separate proposals? Is that advisable? I queried this on the GSoC mailing list and I was informed that it is based on the organisation's discretion.

Yes, you can submit multiple proposals to multiple projects (up to 3 proposals total I believe).

Chances are you are only going to be picked for one project, but I think it is cool to submit multiple proposals (including to multiple projects).