This information may have been posted by someone in the past. But I think that it would be worthwhile to post it again.
This will be of interest mainly to IT people and perhaps their non-IT supervisors and/or managers.
O'Reilly Media has about 60
free ebooks listed at Amazon. They are technical to very technical in nature. Here's
a link to all of O'Reilly's ebooks at Amazon, sorted by price, low to high.
Some, maybe all, of these books will also be available
free at O'Reilly's website in pdf and/or ePub formats, as well as the mobi format. I haven't been able to find a dedicated free ebook webpage at O'Reilly. If you think that you're interested in any of the titles shown at Amazon, but in pdf or ePub format, I suggest that you scan the list of
free O'Reilly books at the webpage at Amazon that I just gave the URL for. If you find at one or more books that you think that you might be interested in, then go to
O'Reilly's website and do a search for the title(s).