What are some alternatives?
When comparing Hatari and Happy Chick, you can also consider the following products
jGameBase - jGameBase is a fully-featured retro-gaming emulator frontend and game database utility.
RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Steem Engine - Steem is an open source Atari STE emulator for Windows and Linux.
Mame - MAME stands for Multiple Arcade Machine Emulator.
Hataroid - Atari ST emulator for Android based on Hatari.
LaunchBox - LaunchBox is a portable, box-art-based games database and launcher for DOSBox, emulators, arcade cabinets, and PC Games. Download it free!