Renderosity has started posting the Xmas freebies.
You must be registered to see the links
You have to visit the pages and "claim" the freebie, but it must be done within 24h. For instance today giveaways must be claimed before 00:00 CST 14/12 (that is 06:00 UTC if my computations are correct).
You must be registered to see the links
You must be registered to see the links
You must be registered to see the links
The link to the freebies download page will appear everyday on this link
You must be registered to see the links
Edit: updated refresh times