[Code Combat] is a game to learn programming.
[Roll20] brings pen-and-paper gameplay right to your browser with a rich set of features that save you time and enhance your favorite parts of tabletop games. Video and voice chat, shared images, music and sound effects, and built-in support for hundreds of rule systems make Roll20 an award-winning virtual tabletop loved by over four million players
[GameBlocks] provides video game publishers with powerful and intuitive middleware that allows them to combat cheating, manage gameplay, and monitor their titles performance from macro to granular levels.
Amazon has a new game streaming platform called [Luna].
[OpenGameArt] has free audio, textures, and 3d models.