Lunchclub - Curated 1:1 professional connections
The Starter Kit - Curated resources for web developers and visual designers
Serendipity - Serendipity is a PHP-powered weblog engine which gives the user an easy way to maintain a blog.
Startup Network - Predicting successful startups using AngelList data
Lunch Roulette - Collaboration by grouping coworkers randomly for lunch.
Supscrib - The new way of subscribing to newsletters