Plato - Share knowledge with your team through simple Q&A
Krugle - Krugle is the complete enterprise solution for search targeted to the development organization.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
OpenGrok - OpenGrok is a fast and usable source code search and cross reference engine.
Hustle Crew Membership - Resources and workshops to be anti-racist
Sourcegraph - Sourcegraph is a free, self-hosted code search and intelligence server that helps developers find, review, understand, and debug code. Use it with any Git code host for teams from 1 to 10,000+.