An open-source Android app called DroidDeck recreates Valve's SteamOS Big Picture experience on handheld devices, including Windows game compatibility through ARM64 Proton, according to its GitHub repository.
DroidDeck requires Android 9 or newer on a device with an Adreno 730 GPU or better and needs no root access, the repository says. It bundles a Linux runtime, a desktop environment and app emulators, and integrates with the GOG, Epic Games and Amazon Games storefronts alongside a launcher for non-Steam games.
The project builds on existing work from other open-source efforts, including WinNative and Bannerlator, and incorporates frame-generation technology from the Eden emulator project, according to the repository. It states plainly that "Steam and Proton belong to Valve Corporation" and that the project is not affiliated with Valve.
DroidDeck has drawn more than 5,200 stars and is released under the GPL-3.0 license, according to the repository.
Valve's own Steam Deck runs a locked-down version of this same idea on dedicated hardware. An open-source, unaffiliated project getting most of the way there on ordinary Android phones is the kind of gap-filling work that tends to last right up until the platform holder decides it is worth contesting.