A frontend GUI for the gogrepo.py Python script that interacts with GOG.com.
The gogrepo.py script obtains a manifest of a user's game file library at GOG.com, and enables updating that manifest locally and downloading the game files (including related extras), and verifying those downloads, etc.
The gogrepo.py script can be found here - https://github.com/eddie3/gogrepo
Kalanyr's forked version of gogrepo.py can be found here - https://github.com/Kalanyr/gogrepoc
GOGRepo GUI makes things easier to do, especially for those not comfortable with the command-line or using BAT files, plus it has some additional features.
BIG THANKS to woolymethodman, Kalanyr, etc for gogrepo. https://www.gog.com/forum/general/gogrepopy_python_script_for_regularly_backing_up_your_purchased_gog_collection_for_full_offline_e/page1
And thanks to Flyingfluffypiglet and Lifthrasil for extra inspiration.