Skype is an instant messaging and VOIP (Voice Over Internet Protocol) client to communicate with people in a distant place.

Tox is a peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption.

RetroShare is open source software for encrypted filesharing, serverless email, instant messaging, online chat, and BBS, based on a friend-to-friend network b…

ICQ is an open source instant messaging software.

Bitrix24 is a free (for small businesses) social enterprise platform.

Blink is the best real-time communications client using the SIP protocol.

Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.

Slack is a cloud-based team collaboration tool.

Empathy is an instant messaging (IM) and voice over IP (VoIP) client which supports text, voice, video, file transfers, and inter-application communication ov…

Wire is a cross-platform, encrypted instant messaging client created by Wire Swiss. It is available for iOS, Android, Linux, Windows, macOS and Web browser cl…

HipChat is a web service for internal private online chat and instant messaging.

Qiscus provide everything you need to power up your app with chats.

Sneek is a constant presence tool for digital nomads, remote jobs.