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https://freedns.afraid.org
Free DNS
a freely available dynamic DNS service.
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https://www.borderzone-software.ch
the company which provides the code which is hosted here. go there for contact information if you would like to use the code in a non-GPL conform way or just to find out about the company.
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https://www.poyyayil.ch
not yet much to see there. it's the private homepage of the main developer. go there if you'd like to get to know more about him.