Lunchclub - Curated 1:1 professional connections
Words - Software for improving your english vocabulary.
Serendipity - Serendipity is a PHP-powered weblog engine which gives the user an easy way to maintain a blog.
Medium - Welcome to Medium, a place to read, write, and interact with the stories that matter most to you.
Lunch Roulette - Collaboration by grouping coworkers randomly for lunch.
Dataset Search - Making it easier to discover datasets. Made by Google.