Lunar Client - An all in one Client side anti cheat built by the same people who made CheatBreaker.
PolyMC - Fork of MultiMC with additional features like mod downloading and supporting other package formats like flatpak or appimage
Badlion Client - Custom minecraft 1.7.10, 1.8.9 and 1.12.
GDLauncher - GDLauncher is a custom Minecraft launcher with simplicity and power in mind. It allows users to create custom instances (also with forge), download curse modpacks and mods and more!
MultiMC - Overview: MultiMC is a free, open source launcher for Minecraft, managed by Forkk13and peterixxx...
Chunk Launcher - Minecraft game launcher. Main features of the launcher is the same as the official launcher, including managing game versions, player profiles and launching minecraft. ChunkLauncher also supports Minecraft Forge game versions.