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.
WhatsApp for PC is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS.
Store and sync your email, calendar, contacts, files and documents in the cloud - yet have them locally accessible and aggregate information across accounts like Yahoo! Mail, Gmail, Hotmail and social networks like Facebook and Twitter
Instant access to The Pirate Bay, even if your provider does not allow you to visit it!
Zoom is an easy, reliable cloud platform for video and audio conferencing, chat, and webinars across mobile, desktop, and room systems.
Thunderbird is email and calendar software by Mozilla (the maker of Firefox) that offers the same functionality as the (commercial) office application Microsoft Outlook.
Software bundle from Microsoft containing Mail, Messenger, Movie Maker, Photo Gallery, Writer, Toolbar and Family Safety.
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.