RMG v0.1.4 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:
Introduce ROM browser cache
Allow GLideN64 settings window to be resized (gonetz/GLideN64#2667)
Add %f to desktop file, allowing n64 ROMs to be opened with RMG without using the commandline
Add MimeType to desktop file (thank you @JakobDev)

Download: RMG v0.1.4
Source:Here