Licence
Akagoria is a free software and is distributed under the GPLv3 licence, including the assets.
Source code
The main source code of Akagoria is available in the Akagoria project on GitHub.
Akagoria uses Gamedev Framework (gf) as its main library. It is developed at the same time as Akagoria.
Documentation
The developer's documentation is intended for people developing the game. It contains many information about about the world of Akagoria is built.
IRC
If you want to talk directly with the developpers, you can join the #akagoria IRC channel on freenode.