Not sure if the link will work, but here is an amazing list from  last year's game jam.  Link to previous year's free asset list

They will probably assemble another list as we get closer.

Thank you! This was the immediate question I had as a lot of the assets I would have used I acquired from things like Humble Bundles and the like and I guess those can't be used in the Jam. 

This is really helpful but also hope they provide an updated list, thanks again!

This is really useful, thank you!