RMG v0.4.2 is released. Rosalie's Mupen GUI is a free and open-source mupen64plus GUI written in C++. It offers a simple-to-use user interface.

RMG changelog:
Fix window behavior issues when saving GLideN64 settings while in-game (see gonetz/GLideN64#2785)
Add VRU support to RMG-Input
Add controller hotkey support to RMG-Input
Improve window title by using the ROM filename when the ROM isn't in the database

Download: RMG v0.4.2
Source:Here