ID Checker
Website: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/1279866-1-0-0-id-checker-v3-resolve-id-conflicts-withoutI know what you people will say, "YOU COPIED THIS MOD FROM SHAROSE! HE MADE AN ID RESOLVER!". And my reply is: No, I made my own mod. Sure it may do the same thing, and sure it might look like I copied it, but I didn't. Originally this mod just showed used/free ids for people who were planning on installing more mods so they can configure them beforehand. I got a couple of requests for people on irc to make it able to resolve conflicts and I thought it would be a nice challenge.
For Minecraft 1.0.0
v3
idchecker-1.0.0-v3.zip
bc0caf4e4b770c0b7dc5a4603a6b550c8aeb60e6206ce5d741060b3d63fc17fc
idchecker-1.0.0-v3-forge.zip
236cc067b76b4240518af372e158482eec5aab5f17a99d1ce3f8642cf825f2b7