Tweetie

Excellent Twitter client exclusively for Mac

Free and simple chat client for Mac that features QR code invites and group chats

Connect with friends in the hottest new system for chatting about the newest photos to hit the platform

Chat with one or more people with messages synced to other devices

A feature-packed instant messaging client from a well-known email provider

Free and simple messaging app for Mac with a strong focus on privacy and security

View and send messages on the desktop page