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.
WhatsApp for PC is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS.
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.
Free calls, text and picture sharing with anyone, anywhere!
Microsoft Teams is the hub for team collaboration in Office 365 that integrates the people, content, and tools your team needs to be more engaged and effective.
Send text messages, voice messages, videos, documents, pictures or group messages and make free phone calls over an end-to-end encrypted connection to keep your communication absolutely safe.
Use your smartphone as a wireless webcam for your PC or Mac with Iriun, no configuration needed!
Lightweight, customizable mail client