KakaoTalk

Kakao's solution to be connected

RetroShare

Create a secure private network to speak and share files

fTalk

Improve Facebook's chat on your desktop

MSN Spy Monitor

Monitor all the conversation that you maintain over MSN

Psi

Simple and efficient instant messaging client compatible with Jabber

Microsoft Lync Server

Total communication for companies

WhatsApp Pocket

Backups of WhatsApp chats on your PC

MSN Winks Plus

Add new winks to Messenger

Palringo

The alternative to TalkBox on Windows

WhatsApp Extractor

WhatsApp backups on your PC

IMBooster

Entertaining collection of emoticons and winks for Messenger

Twist

Instant messaging for work teams

Facebook Chat Desktop

Desktop client for Facebook chat

Nimbuzz

Multi-network instant messaging client

IGdm

More features for Instagram messaging

Emoticon

Hundreds of smileys for your chats and emails

Outlook Connector

Use your Hotmail accounts straight from Outlook

Zimbra Desktop

Manage all your accounts from the same application

Stellar Converter for OST

Convert your Outlook emails to PST format

Free Email Extractor

Easily gather email addresses

Mailspring

Mail client to boost user productivity

IncrediMail

Customize your email's appearance and give your friends a surprise

Mail, Calendar, and People

Plan your day and keep in touch

Thunderbird Portable

Use this email manager on any PC with a USB port

Turbo Mailer

Send mass emails

Microsoft Outlook

Microsoft's email client

Windows Live Mail

Microsoft's multi-account email client

Inky

Receive all your emails in a single client

Mail Bomber

One of the best massive email delivery programs

Yahoo Mail

Access to your Yahoo email account

Spark

Complete mail client compatible with different services