Check-in Apps
25. Check In Easy (Certain)
26. Entry Manager
(Eventbrite)
27. Zkipster: non-ticketed event check-in
28. OnArrival (Cvent)

Planning Calculators
29. Pocket Planner
30. Super Planner
31. iTip
32. Social Tables (includes check-in function as well)

On-Site Non-Cash Payment
33. Square
34. PayPal Here
35. Isis