As some of you know I've been working on my startup Stream for about 5 years now. We've just raised a large series B and it enabled us to make Stream free for hobby/side projects. We announced it today and I'm pretty excited to see what people will build :)
Stream is available for iOS, Android, React, RN and Flutter. I think the Flutter SDK is especially interesting for side projects. It's been amazing to see what small teams can ship on that platform.