Mupen64Plus - N64 emulator and plugins for Linux, Mac OSX, FreeBSD, and Windows
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Project64 - Project64 is a Nintendo 64 emulator for the Windows platform.
Mednafen - Mednafen is a portable, utilizing OpenGL and SDL, argument(command-line)-driven multi-system...
1964 - 1964 is a Nintendo 64 emulator for Microsoft Windows, written in C and released as free software.
OpenEmu - Console and Arcade video game emulator for macOS.