FaceTime is Mac only. Join.me seems geared towards business users and pre-arranged meetings -- I want something more like an IM client where I can see who's online and ask to video chat with them. Also, join.me doesn't seem to have a free plan (only a free trial.)

Signal actually looks great, but their Mac/PC client has been in beta since 2015 and isn't linked from the homepage -- I had to dig it up on their blog. Also, video chat has been in beta since March 2017. It's not clear if their beta non-phone client supports the beta video chat. Still, I'm digging their encryption.

I don't mean to shit over your suggestions, I really am looking for something better. But so far, nothing seems like a clear winner.

appear.in has worked fine with me too.