I think Steam works very well. I heavily use in-homestreaming and big picture mode on my shield and it offers a nice experience that I've yet to see emulated elsewhere. I usually have a browse in the store and watch trailers on the TV before launching my game.

Remote Play is fun on games that support it.

And it runs on osx, linux and windows.

And then theres Broadcasting, chat. Its a heavily featured launcher, and offers way more than some of the alternatives out there.