Disa Alternatives

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.

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

Auto arrange all your app windows, whether on one screen or many with a single click!

Try for free freemium $39.99 / Annually (One PC, One Year)

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

Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.

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

free

Apps/Empathy - GNOME Wiki!

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

Facebook Messenger is a faster way to message.

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.

Full featured and easy to use Jabber client

Open-source video calling and chat platform.

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

Open Source freemium €4.0 / Monthly

Miranda IM is the smaller, faster, easier instant messenger with support for multiple protocols.