ScummVM - Game engine recreation of SCUMM made by LucasArts.
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
DOSBox - DOSBox is a DOS-emulator that uses the SDL-library.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
FairEmail - Open source, privacy friendly email app