Flycast is an open-source Dreamcast emulator currently available for Windows, Linux, macOS, Android, iOS and Nintendo Switch. It is a fork of reicast - another Dreamcast emulator for Windows, Linux and Android. It has a work-in-progress wiki available here, complete with guides and information about various features.
Flycast is a multi-platform Sega Dreamcast, Naomi, Naomi 2, and Atomiswave emulator derived from reicast.