If you're looking to emulate GameCube or Wii games, your best bet is Dolphin. Platforms: Windows, macOS, Linux, Android (Image: Dolphin)
There are legal gray areas surrounding ownership of ROM files, while some emulators require complex setups, but they're one of your best options for a hit of old-school gaming nostalgia. There are emulators for every retro game console-some even support multiple systems-and a variety of operating systems.