So, I got a little tired of forges crappy ID system not automatically fixing IDs and mod developers not just doing it them selves either. Ever have 51+ mods all with id conflicts? Not fun, nor should it be necessary to go through each and every file to figure out what is conflicting.
However, there is hope! I present to you IDScanner. This nice little program will scan your config folder, find possible conflicts, find an unused id, and allow you to CHOOSE to fix them. Afterwards you can take all the configs it generated and replace the old ones.
There is some short comings though. I have no way of detecting which are items and which are blocks or even if they are either. I have really slimmed down the false positives, but there will always be some. SO READ THE DAMN LINES BEFORE YOU TYPE YES!. This system SHOULD detect ALL conflicts though, unlike some other mods that are limited to what they can squeeze out of forges system.
Download the zip.
Unzip to the same place as the config folder.
Run either the bat file or the sh depending on your OS.