TicketTracker
A child check-in and ticket-ledger app for a church kids' room. Free and open source.
Windows installer
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The installer sets up the server on a Windows PC at your church. Kids are then checked in and out, and tickets awarded or spent, from an iPad or Android tablet's web browser by scanning the barcode on each child's lanyard.
One requirement: the PC needs a valid, trusted SSL certificate, or the tablet's browser won't allow camera access for scanning.