Advanced Port Scanner 1.3 (Free Network Tool)- http://www.majorgeeks.com/files/details/advanced_port_scanner.html (Checksums)
Wayback Machine – See how a page appeared when a snapshot was taken.
Wayback Machine “Save Page Now” – Capture a web page as it appears now for use as a trusted citation in the future.
DownThemAll! – add-on for Mozilla Firefox that “lets you download all the links or images contained in a webpage and much more”
web-capture.net – an online tool that saves an entire webpage (better than stitching together multiple screenshots). Save in JPEG, PDF, TIFF, BMP, PNG, PS, or SVG formats.
Qualys SSL Server Test – https://www.ssllabs.com/ssltest/
https://haveibeenpwned.com/ – Check if you have an account that has been compromised in a data breach
http://www.infinitelooper.com/ – Easily loop Youtube videos
Graphpad Online t-test – http://graphpad.com/quickcalcs/ttest1/
Graphpad – A bunch of statistical tests/tools – http://graphpad.com/quickcalcs/
Firebug – Powerful debugging tools for web development – https://addons.mozilla.org/en-US/firefox/addon/firebug/
Built With – Find out what websites are
built with – http://builtwith.com/
HTML to Markdown generator online – http://domchristie.github.io/to-markdown/
Combination Generator – http://textmechanic.com/text-tools/combination-permutation-tools/combination-generator/
Wolfram Alpha Combination – http://www.wolframalpha.com/input/?i=combination+3+of+26&x=0&y=0
Permutation Generator – http://textmechanic.com/text-tools/combination-permutation-tools/permutation-generator/
Wolfram Alpha Permutation – http://www.wolframalpha.com/input/?x=0&y=0&i=permutation+3+of+26