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

Viber Free Messenger and Phone Calls.

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

Ekiga (GnomeMeeting) is a VoIP and video conferencing application for GNOME and Microsoft Windows.

ooVoo is a video chat and an instant messaging client.

1Click is a B2C online software which offers video, voice and text chat with collaborative features screen sharing and conversation recording.

Google Duo is a video chat mobile app available on the Android and iOS operating systems.

SightCall remote support software enables live video streaming and remote access on mobile devices and desktops for customer service and tech support.

WhatsApp Messenger is an instant messaging platform owned by Facebook.

Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application.

Yahoo! Messenger (sometimes abbreviated Y!M) is an advertisement-supported instant messaging client and associated protocol provided by Yahoo.

Fring connects with Skype, MSN Messenger, ICQ and Google Talk from your iPhone.

Gajim is an instant messaging client for the XMPP protocol which uses the GTK+ toolkit.

X-Lite is a freeware VoIP soft phone that uses the Session Initiation Protocol.

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