mainly from Lemmy Android post:

confirmed FOSS:

• FastDraw
• Olauncher
• Mlauncher - fork of Olauncher with some additional features?
• Lawnchair
• KISS Launcher
• TBLauncher - fork of KISS
• Kvaesito - search focused
• Neo Launcher
• Ion Launcher

non-FOSS afaik:

• Niagara Launcher
• Hyperion Launcher - dead? not a lot of info
• Action Launcher
• Total Launcher - older and not maintained?
• Octopi Launcher - new and under development