Create your own Portable Bookmark Library with Start.me
News:
http://diglearning.global2.vic.edu.au/
Mathematics
mathplayground.com
https://www.mathsisfun.com
https://www.youtube.com/c/3blue1brown
Multimedia
VividMaths https://www.youtube.com/channel/UCYxuKF7OMfJ9FwprYpS3xug
Programming
https://repl.it/languages
Host your own repl.it https://github.com/replit/repl.it
3D Print
https://tiny-machines-3d.myshopify.com/products/creality-cr-10s-large-build-area-3d-printer
NASA Models
https://3dprint.com/141333/nasa-3d-printable-models-kits/
Legacy Microscope Drivers
http://www.oasisscientific.com/downloads.html
Paid to Play games:
https://www.twitch.tv
Computer Science
https://eater.net
https://www.youtube.com/c/beneater
http://www.righto.com/2015/12/reverse-engineering-arm1-ancestor-of.html
Arduino
http://file.allitebooks.com/20170204/Arduino%20For%20Dummies.pdf
http://cmuems.com/resources/getting_started_with_arduino.pdf
http://www.multimedialab.be/doc/erg/2017-2018/Arduino_A_Quick-Start_Guide_2nd_Edition_The_Pragmatic_Programmers_2015.pdf
Photography
https://www.nikonsmallworld.com
Awesome Books:
JavaScript and JQuery Interactive Front-En by Jon Duckett