Rose

More info here.

Dino

More info here.

Hulk

More info here.

Spider

More info here.

Dragon

More info here.

Snail

More info here.

Woodpecker

More info here.

Cricket

Well, it's not really a cricket, but I'm not sure animators would google for Stenopelmatus. The correct details are:

Jerusalem crickets are a group of large, flightless insects of the genus Stenopelmatus. They are native to the western United States and parts of Mexico. Its large head has inspired both Native American and Spanish names.
Despite their common name, Jerusalem crickets are not true crickets, as they belong to the family Stenopelmatidae, while crickets belong to the family Gryllidae; nor are they native to Jerusalem.

Anyway! :)

Download the rig here.

Blackhawk

More info here.

Glass

More info here.

Bow

More info here.

Horse

More info here.

AK47

More info here.

Sword

More info here.

Minnow

More info here, direct download here.

Sharky

More info here, direct download here.

Jelly

More info here, direct download here.

Cody

More info here.

Benny

More info here.

Benny Body Demo from Long Winter Studios on Vimeo.

Benny Face Demo from Long Winter Studios on Vimeo.

Hotel Transylvania Zombie

Very cool that Sony Pictures Animation is giving away their rig from the movie (at least the model, not sure how production accurate the rig itself is)! Head over here for the rig!

Mery

Find out more about it here and download it here.

Scotty Bluebaker

 

Find out more about it here.

Mike and Tina

Find out more about it here.

Fish

Head over to Shaun Keenan's site for the fish rigs. There are multiple options at a reasonable price.

BodyMech Rigs

These are not free but for $40 you get a ton of different rigs and it seems well worth it. Head over here for more information.

BodyMech Rigs - Intro from joe daniels on Vimeo.

Squirrels

Animation Mentor released another free rig! Head over here for tutorials and downloads.

World Zombination character rigs

 

Head over to this page to learn more about those cool free rigs!

Updated with an additional rig: Lady Squidfinger

Claire

Another very cool looking rig by Long Winter Studios. Check out the clip that also includes Tom:

Tom

Another very cool looking rig by Long Winter Studios. Check out the clip that also includes Claire:

Argus

The Argus rig is looking very cool. You can check out the Long Winter Studios' rig selection here.

Animus

Find out more about it here.

Animus Rig (short) from Nick Miller on Vimeo.

Stewart

Head over here to read up on all the goodies and especially where and how you're allowed to use the rig!

Sophia

Download the rig from Sharecg.com.

Low Poly Micro Rigs

These are not free ($10 each), but they're cute. Don't remember how I found them and there could be more out there like that but so far there's this:

Low Poly Micro Werewolf Otis




Low Poly Micro Zombie Brian

 

Low Poly Micro Skeleton Tom




Low Poly Micro Mummy Taal



Low Ply Micro Orc Gronk



Low Poly Micro Dragon Fino



Low Poly Micro Ghost Hubert



Micro Cat Cloe



Micro Cow Ulli



Micro Pig Melvin



Micro Rooster Rudy

Willy

More information about Willy the rig can found in the 11secondclub thread.

Batman Beyond

Find out more about it here.

Bill The Sailor

Find out more about it here.

Drone Ship

You can download this rig directly from here (in zip form), thanks for Dharmin Doshi.

Black Panther

Head over to Turbosquid for the download link and if you want to see all the rigs he's offering (although the rest is not free, but cheap nonetheless), head over here.

Patrick

Not free, but not expensive either, check out the Patrick rig at longwinterstudios.com and watch the clips below:

Dog

Find out more about it here.

Rexxy

This cute looking rig is by Neil Easton and the link for direct download is here. Below is a test showcasing the rig. Thanks Neil for sharing it!

Ben

Find out more about it here.

RC

Find out more about it here. (link is dead, anybody found it somewhere else?)

Kien

Head over here and grab the rig by either tweeting or posting on Facebook about it. The actual site needs registration. Looks to be all free (I haven't signed up yet).

Bonnie

Find out more about it here, including demo and sample clips.