AI and automation tools
212 tools in 26 categories, 5 of them open source. Free plans and starting prices come from each vendor's own pricing page, checked 21 October 2026.
Calendly
Booking-link scheduler with routing forms, Stripe and PayPal payments, and AI add-ons for notes and email
Cal.com
Scheduling with unlimited event types free for one user; its open-source edition now continues as Cal.diy
Zoho Bookings
Zoho's appointment scheduler with a free one-user plan, round-robin algorithms and resource booking