iTerm2 is a terminal emulator for Mac OS X that does amazing things.

KeyCastr, an open-source keystroke visualizer

Staggeringly powerful macOS desktop automation with Lua

Mac Mouse Fix - Make Your $10 Mouse Better Than an Apple Trackpad!

Patch iOS Apps, The Easy Way, Without Jailbreak.

Clean and simple clipboard manager for developers

A fast, simple graph drawing and data plotting app for OS X and iPad.

A standalone iOS & OSX class for intercepting and proxying HTTP requests (e.g. from a Web View)

JavaScript + the Cocoa frameworks, and then ObjC brackets show up to party as well.

Kill Facebook for iOS's SSL Pinning

Dark wallpaper - dark OS X, light wallpaper - light OS X. That's so simple.

A generic, customizable personal data tracker for iOS

Mac OS X Menubar Countdown