Google Talk
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.
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.
WhatsApp for PC is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS.
Lightweight, customizable mail client
Open Broadcaster Software Studio is cross platform software intended for recording and streaming video from one or more sources, such as webcam, microphone, media files and the desktop.
WhatsApp for web is a platform independent messaging app which allows you to communicate for free.
All-in-one voice and text chat for gamers that's free, secure, and works on both your desktop and phone.
AresGalaxy is a Filesharing Bittorrent P2P client that works even behind firewalls.