m64p (2020/11/30) is released. m64p uses mupen64plus-gui, a brand new mupen64plus frontend written in Qt5. It supports all thing things you’d expect from a frontend (savestate management, pausing, screenshots, etc..). m64p comes bundled with GLideN64 for the graphics plugin. It should give you the best out-of-the-box experience available for N64 gaming.

m64p changelog:
A new option for netplay: Fixed Input Delay. Normally the server will dynamically set the input delay based on latency, but this allows you to set a fixed number of frames of delay. If you set this number too low, it will cause stuttering/freezing. Thanks to @joeldenning for implementing this feature.
Most players are better off leaving this option unchecked. This is mostly for players that want to play using very low input latency, the tradeoff being that you'll experience stuttering and freezing at times.