I have just answered a similar question on ResearchGate website and thought that it could also be beneficial for the Academia.SE community to share my answer here as well (as a wiki). Obviously, corrections and contributions are very welcome. Please see my answer (initial wiki post) below.

  • It looks like I don't have enough privileges to convert this Q&A into wiki - moderators, please help in that regard. Thanks. – Aleksandr Blekh Jul 20 '15 at 12:07
  • To those who voted to close this question as off-topic: please clarify how this Q&A (on open course notes and textbooks) is not about academia. – Aleksandr Blekh Jul 20 '15 at 22:30
  • Re: the cited reason for closing. As I said from the beginning, this Q&A is intended to be a wiki collection of useful academic resources on the topic. Therefore, it IMHO doesn't belong to the category of "shopping" questions and, thus, should be reopened and converted to wiki post, as requested. – Aleksandr Blekh Jul 21 '15 at 3:30
  • Have you tried to ask on the meta? – Ooker Jul 26 '15 at 4:24
  • @Ooker: I don't feel a need for this. I have provided my arguments and, if people disagree with them or ignore them, then so be it. I value my time more than an opportunity to defend a single question from closing. – Aleksandr Blekh Jul 26 '15 at 4:43

There exist a significant number of repositories that, in one way or another, contain open source lecture notes and similar or related information materials.

First and foremost, large open courseware repositories contain information on various courses, for many, including course notes. For example:

The second significant source is represented by a multitude of repositories of open source textbooks on various subjects. Such repositories include:

Finally, additional stream of information can be traced to individual university departments, groups, and labs. Usually, such resources are quite narrow in their coverage and might apply to specific areas of a discipline or a course. For example, see the ETH's open source course notes on advanced methods and strategies in organic chemistry. Also, many (IMHO, most) individual professors share their own course notes on their personal university-affiliated websites.

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