Backdoor - Honest and Anonymous Feedback About Colleagues
Startup School - How to start a startup, by Y Combinator
15Five - 15Five software elevates the performance and engagement of employees by consistently asking questions and starting the right conversations.
The Y Combinator Database - The definitive database of YC companies with all the metrics
Briq for Slack - Engage your team with easy daily recognition
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.