FreeJ2ME
A J2ME emulator for Windows, Linux, and Raspberry Pi
FreeJ2ME is a simple J2ME emulator with a focus on old mobile phone games. It was designed to run on Windows, desktop Linux, and on the Raspberry Pi 3 using Libretro and Retroarch as provided by RetroPie.
It supports some games not playable using MicroEmulator and Kemulat0r, though it does not support every game those play. At the moment, it's best to have all three if you're interested in those types of games.
Some games only run at specific resolutions. Per-game configuration...