Lightboard (a.k.a. learning glass) open source https://lightboard.info
Why the open web links it
Introduces the open-source Lightboard, a transparent glass chalkboard for clear, engaging video lectures.
Linked by 6 independent sites, 2 of them widely read in the 2026-10 crawl of the open web, including uwm.edu, slides.com, ac.za, asuka-academy.com, elearningstuff.net.