Mode modifying inquiry

[Hobeak]

Good morning?
My question is, can I modify the mode myself?
And can the modified mode be used on the server?

 

[Ezer'Arch]

The mod is open-source, you can fork and modify the mod from Github.

Please refer to the license for any details: https://github.com/micdoodle8/Galacticraft/blob/master/LICENSE.txt