Top rated in Instant Messaging & VoIP

Access multiple web-based services from a single application.

Rocket.Chat is a Web Chat Server, developed in JavaScript.

Yakyak is an open source chat client for Google Hangouts.

Goofy is your desktop client for Facebook messenger.

Phone App allows you to call from your Mac via your iPhone.

Free Conference Call allows you to host or join conference calls.

It lets you access BBM and text messages from your BlackBerry on your computer.

HeyWire lets you receive and send text messages right from your desktop.

3CXPhone is a VoIP client allowing you to have up to five simultaneous calls.

Beautiful, native instant messaging client for OS X that supports Hangouts/Gtalk and XMPP.

Avaya Messaging Service is an SMS service for the Enterprise.

Free, open chat that aims to provide an open, accessible IM environment.

Dial!List is a FRITZ!Box Call Manager for the Mac.

Facebook desktop client with notifications support and menu bar item.

Record calls and conversations in different environments.

Turn-key solution for a variety of real-time communication and cross-platform file sharing services.

Linphone is free and open-source application that provides an internet phone.

VoipDiscount offers a simple tool for OS X to make cheap phone calls.

VoipBuster offers a simple tool for OS X to make cheap phone calls.

Indoona lets you make calls and send messages from a smartphone, PC or Mac.