Native UIDevices & homeby fondoger
Mouse Mapper
Maps your mouse's back and forward side buttons to keys and shortcuts on Windows and macOS.

About
A Windows and macOS utility drawn with MyGo's native UI, with no web view or JavaScript runtime. It maps the mouse's back and forward buttons to a key, shortcut or held modifier, with an optional separate long-press action, and can switch to a chosen input method before sending a shortcut. It keeps running in the background, with a tray icon you can hide and an option to start at login.