What are some free sites similar to Adult Friend Finder for finding adult friends?

There are several free websites similar to Adult Friend Finder that cater to individuals looking for adult friendships and casual encounters. Websites like OkCupid and Plenty of Fish (POF) not only offer dating services but also have features where users can seek more casual connections. The platform Tinder is renowned for its swipe-to-match system which largely caters to those interested in short-term and more relaxed meet-ups. Another site, Reddit, has specific communities like "r/r4r" (Redditor for Redditor) where adults can connect for friendship or more. Meanwhile, FetLife provides a niche service for the BDSM and kink community, with opportunities for like-minded adults to connect. These sites facilitate a vast network of interpersonal connections among adults seeking various types of relationships or encounters.