Adding redream (Dreamcast emulator)
Redream now supports front-ends and will be added in the next update.
But if you wish you can can add it now using the "Edit emulators" dialog in the "Manage system" menu using these parameters:
package: io.recompiled.redream
activity: io.recompiled.redream.MainActivity
accepts zip files: probably unchecked, but I haven't tested this
Leave the other fields blank.