Alley Cat Allies
THE primiere organization advocating for and supporting TNR with a website full of useful and practical information, affordable printed materials, and other resources.
The Feral Cat Spay Neuter Project
A high-volume spay/neuter program in Washington state with a particularly useful scientific focus.
An New York City based organization that is widely considered to be a leading benchmark for how to make TNR work in the community.
The Humane Society of the United States