CONV. - Convert YouTube video to MP3, GIF or MP4

Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.

Downie - Video download for OS X. Downie supports at this moment over 1,000 different sites.

Vamos - Local Event Discovery

Yout - YouTube to Mp3 Converter

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.