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

LuLu is the free open-source macOS firewall

Send User Notifications on macOS from the command-line.

ChatSecure is a free and open source encrypted chat client for iOS that supports OTR and OMEMO encryption over XMPP.

Quicksilver Project Source

Cocoa framework for updating OS X apps

GPG plugin for Apple Mail

Amazon API Gateway sample using Amazon Cognito credentials through AWS Lambda