You can do non-printed e-tickets with Tabletop.Events. Even printed tickets may be used with the e-tickets system.
You can enable e-tickets via Convention Tools > Registration > Settings
Attendees can get to their e-tickets by going to Attend > My E-Tickets in your convention's navigation. There are 3 collection options: no collection, tap to collect, and station collect.
No collection - You’re not collecting tickets.
Tap to collect - The ticket holder shows their smart phone to the event host, and the event host taps on it to collect it.
Station collect - The e-tickets can be scanned using a 2-d hand scanner at a ticket collection station. You can find this collector in the point of sale system.