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.

21 Alternatives To Trillian

Adium

Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.
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Bitrix24

Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!

Blink

Blink is a team and employee app, with a Feed, Chat and Hub (for documents, links, files).
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Brosix

Brosix will improve the efficiency and decrease the expenses of your business by providing you all-in-one features package and many control functions.

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.

Flock

A faster way for your team to communicate
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Franz

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

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.

Samepage

Easy to setup collaborative tool and file syncronization cloud application

Signal

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

Slack

A messaging app for teams who see through the Earth!

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.

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.