Kyber for Slack - All-in-one Slack app: tasks, standups, polls, surveys & more
Lunchclub - Curated 1:1 professional connections
Meetingbird - Powerful meeting scheduling and notes — right in your calendar
Serendipity - Serendipity is a PHP-powered weblog engine which gives the user an easy way to maintain a blog.
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
Lunch Roulette - Collaboration by grouping coworkers randomly for lunch.