pr34ch3r yes, I have encountered this one recently, it was used in one of the self-hosted server apps for photo management, but I got impression that this one also requires monthly payments. But to be honest, I did not do thorough research. I will, thank you.
Do you happen to have any experience with it? As I understand this is just a front-end library and still needs backend somewhere. Start page shows using openstreetmap server as one, I did not reasearch if this at all legal, at the first glance it does not look they offer this as service for public, this is for their internal use on their web site. But again, I had no time to research that.