Adium

Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.

21 Alternatives To Adium

Apple Messages

Learn more about sending and receiving text messages, photos, personal effects and more with the Messages app on your iPhone, iPad, Apple Watch, and Mac.

Digsby

Tagged makes it easy to meet and socialize with new people through games, shared interests, friend suggestions, browsing profiles, and much more.

Facebook Messenger

Facebook Messenger is a faster way to message.
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Franz

Franz is your messaging app for WhatsApp, Facebook Messenger, Slack, Gmail, Telegram and many many more.

Gajim

Full featured and easy to use Jabber client

HexChat

HexChat is a fork of XChat with bug fixes and new features.
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IM+

Chat everywhere! IM+ is the most widely used mobile IM app! Connect all-in-one to MSN, Yahoo!, Goo…

Jitsi

Open-source video calling and chat platform.

LINE

LINE is a Japanese proprietary application for instant messaging on smartphones and PCs.
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Nimbuzz

Get the latest, headlines, breaking, regional news fast.

Pidgin

Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.

Psi

Psi is a multi-platform and standards-based instant messaging client available for Windows, Linux, Mac and more.

Rambox

Free, open source and cross platform messaging and emailing app that combines common web…

Signal

Fast, simple & secure messaging. Privacy that fits in your pocket.

Telegram

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

Tox

Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.

Trillian

Trillian is a decentralized and federated instant messaging platform that lets your whole company send private and group messages, keep tabs on what co-workers are doing, share files, and much more.
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WeChat

WeChat is a complete mobile communication and private social networking app.

WhatsApp

WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.

Wire

Private & Secure Messenger

irssi

Irssi is a terminal based IRC client for UNIX systems.