I wanted to write about this browser-based MMO game called Ironbane for a while, but never actually got around trying it (it's easy though, no need to register for the alpha currently, just hit play; but for me under Linux with Firefox 23 it just kept loading and loading... could have been my very slow connection though). Luckily the creator got into contact with us to remind me about it.
Here is an slightly older video of the tutorial level:
The code (GPLv3) can be accessed on Github, and there is a nice contributors guide. The author also confirmed that there are plans to release all the artworks under CC-by-SA soon, so it can be called a proper FOSS game.
But regardless of that, I feel they need to work on the huge pixel (ok actually texel) density spread, e.g. the strongly different size of individual pixels on the screen ;)
We also asked the creator about any longer plans to commercialize it and this is what he got to offer in that regard:
Which I guess sounds like a good idea to fund further development and hosting costs.When we reach beta we would like to offer optional stuff like houses, special clothes and other things for donations (nothing that can give an unfair advantage). So in a way this can be classified as F2P, yes.
Anyways... unless you live in the same internet darkage like me, there is no reason not to give it a try!