Legal Bits
To be clear, Synclias is not associated with any way with any of the sites/domains covered in the docs/videos.
With regards to the key techs:
OPNsense
OPNsense is a Deciso brand - https://www.deciso.com/
Website: https://opnsense.org/ Contact: project@opnsense.org
Technitium DNS Server
Technitium is developed and owned by Shreyas Zare
Website: https://technitium.com/ https://technitium.com/aboutus.html
(Personal note from Mark Henning - Technitium DNS is truly an amazing product)
ASN Database
The ASN DB Data is provided by RouteViews This data is licensed by the Creative Commons v4 with Attribution license