Discord
All-in-one voice and text chat for gamers that's free, secure, and works on both your desktop and phone.
Stop paying for TeamSpeak servers and hassling with Skype. Simplify your life.
Mobile messenger app with free voice & video call over 3G/4G & Wi-Fi.
Share photos, videos, music, files, documents and more between all of your devices. File sharing from phone to PC, phone to phone, PC to phone, PC to tablet.
The qBittorrent project is offering a compelling alternative to uTorrent. This endeavor is marked by its commitment to providing an open-source solution that embodies efficiency, simplicity, and accessibility in file sharing and torrent downloading.
OnionShare lets you securely and anonymously share a file of any size, without any third party involved.
Slack simplifies business communication. It brings all your team's communication together, giving everyone a shared workspace where conversations are organized and accessible.
Call or send instant messages. Google Talk has been replaced by Google Hangouts as an add-on for the Chrome browser, but it's still available here for download.
Facebook Messenger for anyone who wants to have persistent access to Facebook chat.