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custom-hot-corners-extended
A GNOME Shell Extension that allows you to give a function to any corner or edge of your monitors and expand your keyboard capabilities.
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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.
CHC-E extension can toggle dark mode for both at once, using a mouse or keyboard shortcut. The latest GitHub version also supports new Ubuntu accented Gtk themes.
I'm using Night Theme Switcher (https://extensions.gnome.org/extension/2236/night-theme-switcher/) in combination with adw-gtk3 (https://github.com/lassekongo83/adw-gtk3) for this purpose.