What are some alternatives?
When comparing RetroX and OpenEmu, you can also consider the following products
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
MESS - Emulates most gaming systems that exist, emphasizing accuracy over speed.
higan - higan was formerly known as bsnes. The project was renamed after becoming a multi-system emulator.
Mednafen - Mednafen is a portable, utilizing OpenGL and SDL, argument(command-line)-driven multi-system...
Mame - MAME stands for Multiple Arcade Machine Emulator.
ePSXe - ePSXe (enhanced PSX emulator) is an emulator of the PlayStation video game console for x86-based PC...