The best DOS Emulator alternative to LaunchBox is GameHub, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to LaunchBox and four of them are DOS Emulators so hopefully you can find a suitable replacement. Other interesting DOS Emulator alternatives to LaunchBox are D-Fend Reloaded, DBGL and Boxer.
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It's focus is on launching native linux games. Doesn't support adding a complete no-intro romset, and it's wine/proton support is dismal