FeatureCreepMC is exists for many different versions of Minecraft. You may select your Minecraft Version and ModLoader.
Extended Support Release (ESR) are the suggested builds.These are the most stable builds are are suggested for most modpacks and servers.
Nightly Builds are unstable builds, they have the most cutting edge features, but are often more inconsistant, have less textures, have more bugs, and are just less complete and polished. They are suggested for people who want the most cutting edge features before everyone else. 3,0 Will be the 1st Nightly Version
Forge (Forge-Old) is currently the only modloader. We plan on migrating to LitLauncher in FeatureCreepMC 4.0.