JumpQuilt is a mod that allows the use of Quilt mods in CurseForge modpacks, by loading Quilt as if it were a Forge mod. It is a fork of Jumploader, which was well-known for doing this with Fabric until CurseForge got native Fabric support. It only loads if your game was launched from Forge/ModLauncher, so it won't do anything if your Minecraft launcher already supports Quilt.
Requires a Forge version that uses ModLauncher (or ModLauncher on it's own, without Forge) - this usually means 1.13 or newer.
Please make an issue on the Github issue tracker if you have any issues with the mod.
JumpQuilt installs the latest version of Quilt loader when you first launch the game, but it doesn't automatically update it afterwards to prevent breaking existing modpacks. If you want to change the version it installs, edit the pinQuiltLoaderVersion property in the jumpquilt.json config file to the version you want.