The 5-second pitch: ENGi is a cross platform game library that supports Mac, Linux, Windows, The Web, (soon) native Android, and (right now) iOS and Android through CocoonJS. You can check out the project on Github.
Back-story I have been trying to create a cross-platform 2D game engine in Go for quite a while now. There have been a few good starts, but building for some important platforms (like the web and mobile) was impossible.
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