Lunchclub - Curated 1:1 professional connections
Slackbot Workout - A slackbot to get your team in shape
Serendipity - Serendipity is a PHP-powered weblog engine which gives the user an easy way to maintain a blog.
Finn Slack Bot - Finn makes doing things with lists easy and a bit more fun
Lunch Roulette - Collaboration by grouping coworkers randomly for lunch.
BuyerBot Slack Bot - Amazon purchasing for Slack teams