More browser-based RPG goods for you today: the developer behind the game Moonshades recently indicated on the Opengameart.org forums that this neat old-school (ok not as old-school as Heroine Dusk) dungeon crawler is now fully open-source.
Have a look at the alpha game-play:
It seems the entire game (including the source-code) is released under the rather art focused Creative Commons Attribution (cc-by 3.0) license, but since that is pretty compatible even to the GPL, this shouldn't really matter at all.
Have fun playing!
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