Cakebrew is an open-source graphical desktop client for Homebrew package manager. It's very useful especially for normal users to manage brew packages. Cakebrew lists all packages in their categories as installed and outdated.
Cakebrew was based on a project by vincentsaluzzo. Although most of the original code has already been modified, his project was the kickstart for what would become Cakebrew, and his commits are still in the working tree.