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PluginLoader
Discontinued A plugin loader for the Steam Deck [Moved to: https://github.com/SteamDeckHomebrew/decky-loader]
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Don't install PowerTools from the release unless you absolutely have to. If you follow the regular installation steps, you'll avoid all that faffing about with the filesystem
Install steps for Decky are exactly the same, except you paste curl -L https://github.com/SteamDeckHomebrew/PluginLoader/raw/main/dist/install_prerelease.sh | sh into Konsole instead (note the "prerelease"). Further details are on the Decky Loader README if you need them.