LaunchBar and Quicksilver
I bought a license to LauchBar on the recent MuPromo. I installed it, tried it, watched videos of it on YouTube. I can’t, however, bring myself to stop using Quicksilver. It is the original keyboard launcher / utility and I really like it. It had some dark years but I stuck with it. Now it is in development again in an open-source fashion and is quite functional. There are regular updates. I recommend you check into Quicksilver.