Have you tried https://www.nitrous.io/ https://www.nitrous.io/ - It may not meet the wide range of projects criteria, but it's pretty nice. (I'm not affiliated

Have you tried https://www.nitrous.io/ https://www.nitrous.io/ - It may not meet the wide range of projects criteria, but it's pretty nice. (I'm not affiliated, just have used it for pair programming before with success)