netstat -tapshows what's listening
- SecTools.Org: Top 125 Network Security Tools
- https://nmap.org/ - network mapper
- Clouds Google tracking by submitting false searches. Would probably be obsoleted by something like Tor.
Traffic security ∞
Referer protection ∞
Your browser links details when it follows a links, letting a server know where users come from. One solution is to use a third-party service, so that.. only that third-party service can track users. Sigh.
(No services have been noted.)