OpenBravo POS used to be ok, it even worked with barcode readers. But you could also manually punch up a sales receipt and it would adjust on hand numbers automatically. But Open Bravo has moved on to a cloud paid model. However there a few forks from the before time, like Unicenta, but I've never used that one and can only vouch for what it was back in the day. - Source: Reddit / over 1 year ago
I would recommend going with https://opensourcepos.org/ or https://unicenta.com/. - Source: Reddit / over 1 year ago
Unicenta works pretty well on a POS that I salvaged from a shop closure last year (no reason for doing so - just thought it would be cool to have one for the hell of it). Runs on Linux as well as Windows if you want to escape Windows Embedded 7. - Source: Reddit / over 1 year ago
Looks like Unicenta is an alternative POS that can be self-hosted and is licensed as GPL-3.0-or-later. - Source: Reddit / almost 2 years ago
Do you know an article comparing uniCenta oPOS to other products?
Suggest a link to a post with product alternatives.