Technical
Amateur Radio Club International
http://www.qrparci.org/
Amateur Radio Station Communication Software (EchoLink)
http://www.echolink.org/
CQ100 QsoNet (Amateur Radio)
http://www.qsonet.com/index.html
Envelope printer
http://www.yasdc.com/ep2.php
World Wide Web Consortium (Web Standards)
http://www.w3.org/
Website Java Scripts
http://www.dynamicdrive.com/
HTML and CSS Tutorials (and stuff)
http://www.htmldog.com/
HTML For Beginners
https://html.com/
Add lighting effects to your images
http://vicman.net/lightartist/
Find that product manual:-
http://www.manualsonline.com/
http://www.manualslib.com/
https://www.ifixit.com/Guide
Samsung PC Studio
https://www.techspot.com/downloads/5935-samsung-pc-studio.html
Tone generator
https://www.microsoft.com/en-us/p/tone-generator/9wzdncrdhjqn?activetab=pivot:regionofsystemrequirementstab
Ofcom Online Services
https://ofcom.force.com/licensingcomlogin
Template maker. On-line.
https://www.templatemaker.nl/en/
Awesome Ideas for Metal Works
https://www.inspirationalz.com/crafts/awesome-ideas-for-metal-works/
Autodraw. Sketch assistance. You draw roughly what you want, it makes it perfect!
https://www.autodraw.com/