Meetingbird - Powerful meeting scheduling and notes — right in your calendar
The Y Combinator Database - The definitive database of YC companies with all the metrics
Standuply - Run daily standup meetings and track your metrics in Slack
Startup School - How to start a startup, by Y Combinator
Navigator - The Teamwork assistant — run great meetings without busywork
Y Combinator Companies - Interactive list of all 1000+ YC companies