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.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Vamos - Local Event Discovery
Annotate.tv - Optimize your learning on YouTube
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
BookmarkSheet - Your bookmarks in Google Sheets