Whether you are using offline judging or online judging you can always export your submission data to use as part of the judging process. Once all projects have been submitted you can export the submission data by going to the metrics section of your hackathon.
Note: if your export is empty that may mean you didn't set the visibility of your submissions. Read about moderating submissions here.
In-person hackathon judging
Every hackathon runs judging differently, with the most popular method being a science faire style expo. Most in-person events that run judging this way need a way to show hackers, judges and spectators where each project is located, which is why we built Devpost Expo.
Devpost Expo allows you to import your submission data with table numbers assigned, show off where each project is located, and what prizes/categories they've entered into.