There are 2 repositories under j2me-emulator topic.
J2ME emulator for Android (unofficial fork of https://github.com/nikita36078/J2ME-Loader)
Microemulator is pure Java implementation of J2ME in J2SE
A free cross-platform desktop J2ME emulator with 3D support from J2ME-Loader
A free J2ME emulator with libretro, awt and sdl2 frontends.
Mirror of phoneME SDL builds for GP2X, GP2X Wiz & Caanoo. Published as found.