Got a git repo you want a notification for when others commit to? Maybe it's your work repo (doesn't have to be github, can be any git repo). This app fits the bill. On the other hand if your looking for something to monitor github pull requests and comments, checkout Trailer.app.

CocoaPods is the dependency manager for Cocoa projects. It has thousands of libraries and can help you scale your projects elegantly.

Think of it as PHP's Composer, but for iOS/Mac apps! My team Alpha at AOL used this for building the Pip messaging app.

MacDown is an open source Markdown editor for OS X, released under the MIT License. It is heavily influenced by Chen Luo’s Mou. Chen Luo announced he couldn't actively continue Mou development, and wished to sell the ownership of Mou. No suitable offers surfaced. This is an open source version hoping to pick up where Mou left off.

The MacGap project aims to provide HTML/JS/CSS developers an Xcode project for developing Native OSX Apps that run in OSX's WebView and take advantage of WebKit technologies. The project also exposes a basic JavaScript API for OS integration, such as display Growl notifications. Slack is a popular app built on MacGap.

Turn Google Music into a separate, beautiful application compatible with your Mac's media keys and including support for notifications.

A Mac PreferencePane for managing services with launchd/launchctl. If you've got Mongodb, redis, or mysql installed via homebrew, this is a great interface to checking their status and starting/stopping them.

Built by Will Urbina, the OS Xbox Pro is a hackintosh casemodded into an original Xbox dev kit. Check out the video below to see a walk-through of his experiment.