this is one I use the most and seems to be good. My son also is a freelancer and been doing it for years. He said that this is one of the nicers sites. always lots of jobs to bid on.
ttp://www.getafreelancer.com/affiliates/rherdey/
and no fee for signing up they do charge a small fee when you win, just put that in the bid, I do and I explain to the buyer that I did that to get the fee paid for.
Have a great day!!!!!!!