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Event Ticket Wallet
(infosec.pub)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
And you can give any string a barcode, even ones that don't want you to do so, like Starbucks.
I also use Catima regularly.