CoffeeRun - Let everyone enter their order for coffee runs
Lunchclub - Curated 1:1 professional connections
Apprecia - Send and receive appreciations that last forever
Serendipity - Serendipity is a PHP-powered weblog engine which gives the user an easy way to maintain a blog.
QuizBreaker - A fun online quiz game for teams to get to know each other
Lunch Roulette - Collaboration by grouping coworkers randomly for lunch.