Steller - Everyone has a story to tell. Tell yours with photos, videos, and text.
Lunchclub - Curated 1:1 professional connections
Yarn - Yarn is a package manager for your code.
ChitterChat - Speak to 1 new person every week
Startups Anonymous - Anonymously ask questions and share stories. AA for Startups
Lunch Roulette - Collaboration by grouping coworkers randomly for lunch.