Omnikey is described as 'A lightweight, privacy-first macOS command center that combines global shortcuts, advanced gestures, window snapping, and clipboard history into one offline app' and is an app. There are three alternatives to Omnikey for Mac. The best Omnikey alternative is BetterTouchTool. It's not free, so if you're looking for a free alternative, you could try Karabiner Elements.
Customizes input devices on macOS by enabling gesture and button mapping, keyboard shortcut assignment, window snapping, automation, scripting, multi-device integration, and iOS app control. Features include touch bar, Apple Remote, and per-app profiles.
Karabiner, previously called KeyRemap4MacBook, is a very powerful keyboard remapper for Mac OS X. In addition to simple key remapping, it has special remapping modes like Emacs-mode, SandS-mode (Space and Shift).
Easily add more multitouch gestures to macOS, and customize what the gestures do. Multitouch is the most elegant Mac app for utilizing the power of your Magic Trackpad and Magic Mouse.
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