free textbooks or coarseware

7.23: web.adds/openware/free textbooks or coarseware:
I got this list from knowledgeoftoday.org and tested links: 
. when a site offered a catalog of subjects,
sometimes I would try the CS or software development .
more sites with lists of free edu:
online universities:


"We make citizen science websites so that 
everyone can be part of real research online;
"to understand how galaxies formed 
we need your help to classify them according to their shapes."