Alfred is an award-winning app for macOS which boosts your efficiency with hotkeys, keywords, text expansion, and more. Search your Mac and the web, and be more productive with custom actions to control your Mac.
Maintenance is an operating system maintenance and cleaning utility for macOS that you can use to perform miscellaneous computer maintenance tasks: run periodic scripts; rebuild the databases; delete applications, fonts, system caches; and more.
OnyX is a multifunction utility that you can use to verify the structure of the system files, to run miscellaneous maintenance and cleaning tasks, to configure parameters in the Finder, Dock, Safari, and some Apple applications, to delete caches, to remove certain problematic folders and files, to rebuild various databases and indexes, and more.
TinkerTool is an application that gives you access to additional preference settings Apple has built into macOS. This allows activating hidden features in the operating system and some of the applications delivered with the system.