I'm a volunteer dev for https://couchers.org https://couchers.org which was started in response to the Couchsurfing paywall and mentioned in this article. It's

I'm a volunteer dev for https://couchers.org https://couchers.org which was started in response to the Couchsurfing paywall and mentioned in this article. It's steadily growing in both users and features, and is open source and non-profit. BeWelcome is similarly open-source and non profit, which I'd also recommend as a CS alternative (although they have a somewhat different vision to Couchers and CS).