The ICSI Netalyzr: “The Netalyzr analyzes various properties of your Internet connection that you should care about — including blocking of important services, HTTP caching behavior and proxy correctness, your DNS server’s resilience to abuse, NAT detection, as well as latency & bandwidth measurements — and reports its findings in a detailed report. You can check out an example report from a real network to get a better idea of our tests.”
Link to Example report
For me, perhaps others, an informative, though technical report. For example, my results show “No DNS Port Randomization” as a “Major Abnormality,” but I have no idea how to address that problem.