SHODAN has a service where you can use them to monitor your your stuff if you have an account with API access. Schedule and run scans, get alerts if something new or unexpected appears. Has its own API and CLI tool, too.
A wiki full of information pertaining to the construction of sustainable communities, from engineering to water purification, construction, and agriculture.
An archive website about coldwar infrastructure in the US. Has documentation about communications systems and facilities.
3694 links, including 185 private