Disclaimer: I can’t vouch for the ethics or practices of some of these, and definitely not of the people you might meet on them. Always use care with any app or website that connects you with people, and don’t send money to people you don’t know.
General
FetLife.com: Has many groups specifically for singles looking to meet people, as well as supportive groups for all kinds of kinks and types of kinksters. In the FetLife search field, just type in “[Your City] Kinky Classifieds [or Personals],” “[Your City] Hookups,” “[Your City] Kinksters [or Singles] , etc.
Plura: app for parties, workshops, munches, and other events
ForbiddenTickets: Find both online classes and events and in-person ones around the country
Feeld: dating app for “the open-minded community”
Kinkoo: “helps kinky people find like-minded kinksters”
BDSM.com: more for hookups
Fetish.com: dating and community
Specialty
Cougar Life: “connects modern, confident women with energetic younger men”
DailyDiapers.com: “premiere community for Adult Babies, Diaper Lovers, Big Kids, Mommies and Daddies”
Find Spanking Partners: self-explanatory
Heels Dating: for high heel fetishists and foot lovers
Ladyboy Kisses: international site to connect with ladyboys and shemales
Local Cuckold: for cuckold and hotwife dating
Strapon Dating: for strap-on hookups
Mainly Vanilla Dating Sites
(But you can find kinky people too)
Mainly Vanilla Social Media
(But you can find kinky people too)