You're likely looking for Prism Launcher. It's a launcher that makes it easy to manage instances and download modpacks. It's available on flathub.
Modded Minecraft
The Blocky, Modded Side of Lemmy
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I'll look into that, ty!
Edit: if you ended up here from Google prism launcher worked, was dead easy to install, definitely supports vanilla and technic modpacks and seems to support ftb as well. Your search is over, go use prism launcher to play Minecraft on your steam deck.
Have you tried the Controllable mod? It adds support for controllers so you can use the Steam Deck's built in controls for opening menus and moving around in game.
ooooh that could be useful. I was having a bit of trouble with that. I'll have to figure out a way to put together minecolonies, controllable and buildcraft/thermex. Ty!
If you would like a mod that adds a LOD system to allow you to see very far, see the mod named Distant Horizons. The fake rendering chunks allow for a seemly massive render distance at only a fraction of the processing power that actually rendering at 64/128 rendering distance would use, though at the cost of the fake chunks not looking exactly the same as real Minecraft chunks and also the LOD data taking up a large amount of storage space. The upcoming 2.0 version will make it look even more like Minecraft chunks at a cost of increased storage space requirements.