For Zapier integration and tutorials about creating Zaps, read these articles:
Events available in Zapier:
Email sent
Lead marked as interested
Lead marked as not interested
Lead marked as neutral
Lead status changed to "Meeting booked"
Lead status changed to "Meeting complete | not closed"
Lead status changed to "Closed"
Lead status changed to "Out of office"
Lead status changed to "Wrong person"
Lead is marked with any positive custom label
Lead is marked with any negative custom label
Lead marked as specific custom status label
Email Bounced
Email Opened
Reply received
Lead unsubscribed
Campaign completed