Animation Street is another online animation service, try the beta: http://www.animstreet.com/
Not free, but do have free animations. I think the site is based on the 'Truebones' people, who used to give away 500 free animations out of the open mocap set. These are bvh format.
Uses a credit system, the base price for a 'non free' animation is 40 credits. 10 credits = $1USD You can upload and sell your own as well.
You have to search to find the free ones, in the search box type a search phrase and price eg: swim price<1 , you will find about 48 free swim animations.
In previous posts I have mentioned how many models miss out on the RE needed crouch forward, so I thought I would have a look and see what they had. None free, so crouch price<50 brought back a lot. This one http://www.animstreet.com/animations/15145 is an fps bent over walk, searching crouch forward price<50 gets mainly what I would call 'crawl' (on belly) and roll forward.
I will try a few and report back.
ADDENDUM.
Mixed results.
From the Biped compatible model in Max we have previously been able to import bvh and export from it mangled
Into a new Biped model it worked, but with errors.
Importing the bvh into Milkshape caused it to crash
Not a good start.