Phaser is a Javascript based 2D game framework used for making HTML5 games for desktop and mobile. It is free software developed by Photon Storm. Phaser uses both a Canvas and WebGL renderer internally and can automatically swap between them based on browser support. This allows for fast rendering across desktop and mobile.
Phaser games can be packaged into iOS and Android Applications.
Some of the Phaser games Believe Creative developed are
http://lifeofabuilding.nyc/
https://www.funbrain.com/games/word-derby
https://www.funbrain.com/games/cake-monster
https://www.magictreehouse.com/mission-game