MetroTwit
An attractive, sleek alternative Twitter interface with added features
Digsby
An all-in-one email, chat and social networking
Zoom Meetings
An online video conferencing program for business and personal use
iSendSMS
A software package to send multimedia and short text messages to a mobile phone
ICQ
This tool is an instant messaging and VoIP client that works across platforms
Softros LAN Messenger
An instant LAN messaging software application for home or office users
X-Lite
X-Lite is a free SIP softphone from CounterPath for voice and video calls, instant messaging and presence over VoIP.
CommFort
Chat between users, transfer files, and establish a live informant on your network
mySMS
A program to send and receive text messages
LINE
Allows for the making of free voice calls and sending messages easily
Vypress Chat
User friendly chat for windows servers accessible
Ventrilo
Free software used for communication across a server
Free Video Call Recorder for Skype
A video call recorder for recording Skype calls
Pamela for Skype
Allows for audio and video software for windows
Clownfish for Skype
Translate your Skype messages in real-time, allowing recipients to read messages in their language of choice
Paltalk
Paltalk is a free video chat app with thousands of live chat rooms, private messaging and video and voice chat with friends.
Glip (64-bit)
Glip gives users real-time access to communicate and contact with other people
YakYak
A desktop client like Google Hangouts, where you can chat with others.
ZamTalk Messenger
Easily stay in touch with your friends around the world and meet new people
Pinger Desktop 2.0
Send messages for free to people in different countries