In February a new version of Manic Digger has been released and a HTML5 game client with it. Manic Digger is an open-source implementation of block-building games as made famous by Minecraft.
This new version includes new block types, a new much more flexible system for players and other entities, several server enhancements, several bugfixes and lot more.
But the main feature of this version is the release of a HTML5 game client that will allow you to play it directly from your browser (works with Google Chrome, Internet Explorer, Firefox, Safari…).
The full changelog of this version is available here : https://github.com/manicdigger/manicdigger/releases/tag/2015-02-17