Kind of missed this one, but it seems like a mighty awesome 3D ARPG based on the Panda3D engine:

https://www.panda3d.org/forums/viewtopic.php?f=6&t=17300

Code is GPL assets dual licensed to CC-by and GPL (except the music). See https://github.com/wezu/Avolition/

Here are some older videos:
https://youtu.be/_VQlBVdju-g
https://youtu.be/Uf4HEedji4U
https://youtu.be/cmWHYBXafWU

Seems to integrate into a cool level-editor ( https://github.com/wezu/koparka ) too, see:
https://youtu.be/U_ktIFwlrZU

Sadly it has been abandoned by the original creator last year (that is why there is the source release), but it would be really awesome if someone else would pick this up. It certainly looks like a good base to work with :)

Also see here: http://forum.freegamedev.net/viewtopic.php?f=22&t=6718