Omni Plus for Chrome
More About Omni Plus
To use it, type 'op' in address bar and hit space bar. Once you see the extension icon and 'Omni Plus' show up, you can continue typing to choose a command and run it by hit Enter.
It's also open source on Github: https://github.com/JohnCido/omni-plus
You're welcomed to extend it following README document. Or using any available feedback methods to suggest new features.