power app

Invoice app with iCloud syncing.

Companion app for Pogoplug storage devices.

Collaborative wireframing for app development.

Good app-mangement tool.

Open-source Facebook Messenger app.

Popular mind mapping and project management app.

Generate iOS and OS X app icons for development.

Graphic design and illustration app for any professional or beginner.

Quoting headers like Outlook and signatures in Mail.app.

File managing app.