There are many alternatives to Alfred for Mac if you are looking for a replacement. The best Mac alternative is CerebroApp, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Alfred and loads of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Alfred are ueli (Free, Open Source), Station (Freemium), espanso (Free, Open Source) and Quicksilver (Free, Open Source).
LaunchMenu is a free, open source, cross-platform search-based productivity software with similarities to Alfred and Cerebro. LaunchMenu focuses on customisability and extensibility , while also being easy to use through it's one slick interface.
µDock is a lightweight system extension for your Mac. Working in the system toolbar it is almost invisible and always ready when you need it. Use a keyboard shortcut or mouse hotspot to activate µDock. Running processes and all your drives are easily accessible.