Codenvy provides a fully functional free tier with 4 GB of RAM and unlimited workspaces, free and public projects and developers. Premium subscription start at $1/month and offers machines with up to 200GB of RAM. Codenvy also offers an on-premises solution that costs $300/user/year.
The Koding Package Manager (a successor to Apps) is command line tool for installing packages like nginx, Redis, VNC, Wordpress and many others. It consists of officially supported and user-built packages.