A user made campaign for The Battle for Wesnoth, a free/open source tactical strategy game.
Description:
After fleeing from an Orc horde, the former residents of a northern mountain city have been living as thieves and outlaws. Now under Edwin, the son of the last Steward, the ragtag group of outcasts are ready to retake their home.
You need Wesnoth first, see https://www.wesnoth.org/
If you just want to play this campaign, then you can choose Add-ons from the Wesnoth main menu and then search for Revenge of the Rogue.
If you want to improve this campaign, then clone this git repository and put the files in the add on folder. On Linux, you can use a symlink like this:
git clone https://github.com/zeth/rogue cd rogue ln -s `pwd`/Revenge_of_the_Rogue ~/.local/share/wesnoth/1.12/data/add-ons/