Build with Meteor, Rocket.Chat is an open source and SaaS alternative to Slack. Very good performance, great UX, a must see if you want to replace Slack or Atlassian HipChat.

Apache Superset (incubating) is a modern, enterprise-ready business intelligence web application providing: An intuitive interface to explore and visualize datasets, and create interactive dashboards. A wide array of beautiful visualizations…

Open source Content Management Framework to build powerful API with no effort. Strapi comes with an embedded admin panel which has been built to be completely customizable.