Buffer is the most popular social cross-posting service. They have a free tier as well.<p>I haven't seen a CLI equivalent but there's a Buffer API [1] so you could probably build one easily, or wrap it in talk to it from the front end or backend of your own code, etc.<p>[1]: <a href="https://buffer.com/developers/api" rel="nofollow">https://buffer.com/developers/api</a>