Tools and Services
I would like to share some of the useful tools and services I personally use. Some are free, some are paid.

Note that I have no affiliation with any of the software vendors mentioned below, it is also the reader's responsibility to do the necessary research before downloading and consuming third-party software.
It is only my opinion that the tools and services mentioned below deserve a shout out for their great work to receive further recognition. and yes I am fan of Steve Gibson and his work!!
Free Online Tools & Software:
GRC ShieldsUp!
Port Authority Edition – Internet Vulnerability Profiling
by Steve Gibson, Gibson Research Corporation.
GRC ValiDrive
Quickly spot-check any USB mass storage drive
for fraudulent deliberately missing storage.
by Steve Gibson, Gibson Research Corporation.
GreyNoise IP Check
Check your IP address for any signs malicious activity like botnet activities.
Fedora Silverblue is a spin of Fedora (which is also super reliable and modern OS in my opinion) but now is immutable. It uses a clever and unique method of containerization with rpm-ostree. I recommend that you do your research and read more about it – but it also works if you just install it on your grandma computer, it just works.
Product Review TechHut
Paid Software:
GRC DNS Benchmark v2
A unique, comprehensive, super-accurate Windows (and Linux/Wine) utility to determine the exact performance of your local and (any) remote DNS nameservers . . .
by Steve Gibson, Gibson Research Corporation.
SpinRite
SpinRite Restores & Maintains SSD Performance
by Steve Gibson, Gibson Research Corporation.