Fishbowl

Use Facebook from your desktop without opening your browser

2Peer

Share your files in your own private net through Internet

Spaz

Simple Twitter client

Social Monitor

Check how your children use Facebook

Zello

Send voice messages from your PC for free

Clownfish Voice Changer

Change your voice in real time

ooVoo

VoIP client to chat with your contacts

SoliCall

Reduce the background noise in voice conversation over the net

Skype Portable

The portable version of the popular VoIP client

VoipWise

Very complete VoIP client

Skype

Text messages, calls and video calls to and from phones and PCs

QuteCom

SIP softphone to speak and send free messages

Tango

VoIP client for voice and video calls

Zoom

Workplace Video Calling App

Viber

Windows client of the chat and video call app

Extended Share for Google Plus

Share Google Plus publications on other services

Telefuel

Alternative Telegram client focused on productivity for PCs

WhatsappTime

Alternative WhatsApp client for Windows

Telegram Messenger

Telegram's desktop client for Windows

Wassapp

WhatsApp client for Windows

imo

Talk to your friends from your PC

WhatsApp Viewer

Tool to view WhatsApp chats on PC

WA Web Plus

An extension to use WhatsApp Web with more functions

Signal

Instant messaging and chat app that guarantees anonymity

Hangouts

Google's chat for Windows

Messenger Plus! Live

More functions and utilities for Windows Live Messenger

QQ International

The messaging application to communicate at global level

Messenger for Desktop

Facebook Messenger on your Windows desktop

Windows Live Messenger

The departed Messenger by Microsoft

IMVU

Instant messaging and chats in 3D environments

WhatSender

Send multiple WhatsApp messages from your PC