Choice Reviews Online is an amazing resource for librarians and library patrons with an interest in academic and non-fiction subjects. Most of the content is subscription-only, but there is enough free content to make an occasional visit worthwhile.
I use Choice primarily as another source to find out about high-quality free public websites- as a subscriber I can set up interest lists to have titles within specific topic areas sent to me, and I use this service to get monthly lists of websites that have been reviewed and recommended by Choice reviewers, who are mostly academic librarians and subject specialists. After a visit, I usually add these links to one or other of our website collections (you can read more about how we “collect” websites at this link)
This month’s reviews offered a typically great selection of websites on all kinds of topics: