SelfSteam has been released in version v0.1.36.

SelfSteam is a headless web application for adding and editing non-Steam shortcuts from another device while the target machine stays in Game Mode. The tool ships as a Flatpak for the Steam Deck and Steam Machines.

After version 0.1.35, Preflight works again on SteamOS 3.9. There is also new documentation.

Preflight works again on SteamOS 3.9: it used a library SteamOS removed, so games with Preflight on failed to start.

Updating SelfSteam updates Preflight

New documentation: install, using, supported emulators and consoles, how it works, decisions, development

Source: GitHub