Boxbuddy makes it incredibly easy to use distrobox, a great way to install software that might not be available for your distro, but is available on another distro, or just a way to keep a piece of software in a stable state (like DaVinci Resolve with davincibox).
If you use a "gaming distro", I'm sure you've seen Input Remapper. It's a neat utility that can create macros for all your peripherals or rebind keys as you like. Want to bind you controller so it works like a mouse? Possible. Want to macro key pressed by using the forward button on your mouse? Possible.
Did you leave Foobar2000 behind when you switched to Linux? Why not give Fooyin a try. It's a relatively new audio player with aspirations of becoming just as configurable as FB2K. For me replaygain is quite important, and while some other FOSS audio players support it, not many has replaygain generation. And Fooyin does. While also being just as easy to set up and use as Foobar. Worth a look.