Serendipity - Serendipity is a PHP-powered weblog engine which gives the user an easy way to maintain a blog.
Lunchclub - Curated 1:1 professional connections
Donut Slack Bot - Get matched with a new coffee buddy each week in Slack
Snack - Read all your favorite email subscriptions in one app
Lunch Roulette - Collaboration by grouping coworkers randomly for lunch.
Coworker Coffee - Coffee with a different coworker each week