Goldberg Emulator - Steam emulator that emulates steam online features.
Wine - Open Source Software for running Windows applications on other operating systems.
Darling - Run macOS applications on Linux
CodeWeavers CrossOver - Don't buy a Windows license, don't reboot and don't use a Virtual Machine. Try a free trial of CrossOver to run your Windows software on Mac, Linux and Chrome OS.
WineBottler - WineBottler is an App to manage and wrap your Windows apps into convenient OS X apps.
QEMU - QEMU (short for "Quick EMUlator") is a free and open-source hosted hypervisor that...