LaunchBox - LaunchBox is a portable, box-art-based games database and launcher for DOSBox, emulators, arcade cabinets, and PC Games. Download it free!
Wine - Open Source Software for running Windows applications on other operating systems.
Playnite - Source code generated using layoutit.com
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.
Photon Game Manager - Photon is an advanced game launcher that is designed to make your game collection look amazing.
PlayOnLinux - PlayOnLinux will allow you to play your favorite games on Linux easily