Minecraft Forge is an excellent API for developers of mods for Minecraft. Most authors create their own fashion, based on this mod. Minecraft Forge has become popular because of easy installation and collaboration of a large number of mods.
ForgeModLoader (FML) is part of Minecraft Forge. This mod is not to be confused with outdated Risugami's Mods/ModLoader. Added three installer: exe, jar, and universal. If you have installed Forge, FML do not need to put, because it is already included in Forge