Messaging Apps

Telegram
Free (Open Source)
A messaging app with a focus on speed and security.
WhatsApp
Free
A cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS.
TeamSpeak Client
Free
Quality voice communication via the Internet.
BeeBEEP
Free
An open source, peer to peer, LAN messenger.
Viber
Free
Lets you send free messages as well as make free calls to other Viber users, on any device and network, in any country!
Beeper
Free
All your chats in one app
LAN Messenger
Free
A free instant messaging application for communication over a local network.
Linphone
Free
Communicate freely with people over the internet, with voice, video, and text instant messaging.
Discord
Free
All-in-one voice and text chat for gamers that’s free, secure, and works on both your desktop and phone.
Skype
Free
Skype keeps the world talking. Call, message and share whatever you want for free.
Softros LAN Messenger
Free Trial
An easy-to-use LAN messaging application for safe, secure and effective intra-office communication.
Gajim
Free
A fully-featured XMPP client.
IP Messenger
Free
A pop up style LAN Messenger.
mIRC
Free
A popular Internet Relay Chat client used by millions of people, and thousands of organizations, to communicate, share, play and work with each other on IRC networks around the world.
Rambox
Free
The only way to organize your workspace and boost your productivity.
Snapchat
Free
AdiIRC
Free
An IRC client with multiserver support and a customizable interface.
Chatterino
Free
Ekiga
Free
An open source SoftPhone, Video Conferencing and Instant Messenger application over the Internet.
Element
Free
Secure and independent communication, connected via Matrix.