Data-oriented projects

Cat Stats: A project from Neighborhood Cats, free tool for tracking feral cat colonies
Cat Watch: An app to track cats and do outreach, from Cats Protection in the UK
Faunalytics: Animal welfare/animal rights research and consulting  group
Shelter Animals Count: Animal shelter statistics compiled from around the USA

Collaborations of cat and bird advocates

Cats Safe at Home: Feral Cat Coalition of Oregon and Audubon Society of Portland
Keep Cats Safe and Save Bird Lives: Canadian environmental project
DC Cat Count: A rigorous new program to quantify the free-roaming cats a major US city

Research organizations

Alliance for Contraception in Cats and Dogs: Research into non-surgical birth control
Botstiber Institute for Wildlife Fertility Control: Partnered with HSUS

Best practices guides for feral/community cats

Smart TNR: Tracking success to achieve key goals (recorded webinar, highly recommended!)
Association of Shelter Veterinarians Guidelines for Spay-Neuter Programs
American Association of Feline Practitioners Practice Guidelines
Neighborhood Cats TNR Handbook
Community TNR: Tactics and Tools by Bryan Kortis
Best Friends Community Cat Programs Handbook
Alley Cat Allies/ASPCA/Mayor’s Alliance for NYC’s Animals Guide to Trap-Neuter-Return
ASPCA’s Special Considerations for Community Cats at Spay/Neuter Clinics
ICAM Coalition Humane Cat Population Management Guidance
Return-to-Field Handbook by Neighborhood Cats, HSUS, and Alley Cat Advocates

News and general links of interest

Animal Sheltering Magazine: Shelter-focused, with some free-roaming cat topics

Events and conferences

ACC&D’s Symposia on Non-Surgical Methods of Fertility Control: Every few years
Best Friends National Conference: Annual, focused on no kill animal sheltering
HSUS Animal Care Expo
: Annual, brings together array of animal welfare professionals
Maddie’s Shelter Medicine Conference: (Defunct?) conferences for shelter professionals

International animal aid groups I’ve visited or volunteered with

Animal Balance: My favorite traveling spay/neuter project, focused on helping islands
Animals Fiji: Operates several low-cost clinics and small animal shelters
Ayuda Guatemala: Street animal sterilization and care program, focused on dogs
Egyptian Society for Mercy to Animals: Operates huge cat/dog animal shelters in Cairo
Sarawak SPCA: Runs adoption campaigns, an animal shelter, and clinic in Malaysia
Save Our Strays Kuching: Grassroots street animal rescue/sterilization group in Malaysia
Welfare of Stray Dogs: Runs a shelter/clinic and provides mobile first aid care in Mumbai
Villa Kitty Bali: Cat shelter/clinic in Bali that rescues and cares for cats and abandoned kittens