Communication

Chat clients

Name ⇵	Description ⇵	Get it ⇵	⇵	⇵
Adium	Adium is a free instant messaging application for Mac OS X that can connect to AIM, XMPP (Jabber), ICQ, IRC and more.	Website
Seaglass	Seaglass is a native macOS client for Matrix. It is written in Swift and uses the Cocoa user interface framework.	Github

Social network

Name ⇵	Description ⇵	Get it ⇵	⇵	⇵
TweetBot	Full-featured Twitter client for the Mac with multiple-column support and much more.	AppStore

IRC

Name ⇵	Description ⇵	Get it ⇵	⇵	⇵
Textual	Textual is the most popular GUI application for IRC on macOS.	AppStore

Messages

Name ⇵	Description ⇵	Get it ⇵	⇵	⇵
Chatology	Search and archive trough your message history (iMessage/GoogleTalk/Jabber).	Website