App Store - Discover for Mac
Find apps and games for iPhone, iPad, Mac, and more on the App Store.
Software Db
MacPorts - Search ports
macOS package manager
MacUpdate
MacUpdate is the best way to discover Free Mac Software. Download, install, or update Mac Apps, read user reviews or submit your own.
Packal
Packal.org is the repository for Alfred 2 Workflows and Themes. All Workflows and Themes are user-contributed, and all can extend the Mac OS X application Alfred 2.