As of 21 December 2015, Engine2D is deprecated. Instead, you should use E2D. This blog post explains why.
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Engine2D is a highly extensible barebones game engine.
Engine2D can be used for just about any type of 2D game, with existing HTML5 canvas renderer and collision detection extensions.
Documentation is available here.
We have a development blog here.
Engine2D is hosted by jsDelivr. The latest minified version and full version are both available.
Alternatively, you can download both here.