This document summarizes and compares several online development environments: Nitrous, Codio, Koding, and Cloud9. It finds that Nitrous is the best fit overall as it allows users to create and share cloud virtual machines while also using local tools through the Atom text editor plugin, and provides templates for common languages and frameworks. While the others have advantages like configuration sharing for Koding or being designed for teaching for Codio, they lack the ability to use local tools like Nitrous or share built machines like Koding.