This is not exactly a tool, but can be easily used to extract an almost perfect 1G1R from their Romsets.
To do that, just create a .txt file like the example one and rename it from .txt to .bat and execute it inside the ROMs folder.
Note: Only Official Released games are included in the lists. No Protos, Unlicensed, Demos, etc.
Note 2: A lot of cells are linked to others, so better not modify them manually. You can navigate by pressing each System Name on the Index Tab, and go back to Index by pressing "Go to INDEX" button on the System Tab
If any wrong game or any question, feel free to notify/ask me.
Hope it helps people to sort their rom collection.