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

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.

Facebook Messenger - Facebook Messenger is a faster way to message.

Zulip - Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.

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

Dasher Messenger - Dasher lets you do more than just text message. It's messaging with benefits: