DK Findout - This is an online encyclopedia by Doring Kindersley. It is free of junk ads; the only ads are for DK. It would be good for teaching encyclopedia and online searching use. There are lesson plans and quizzes. It is colorful and well illustrated. It would be good for younger grades and it is free.
Wikipedia - Wikipedia is comprehensive and free. It has no ads. It would good for teaching online searching and encyclopedia use to students with higher reading levels. There have been questions raised about Wikipedia's accuracy, but you could use this to encourage students to search several sources to see if they agree. It is a great number of languages.
Read Write Think Student Materials - Many online tools which will assist students with book reports, report writing, poetry composition, and more. There are also lots of lesson plans. This site is well worth a visit.
The 5 E's of Inquiry Based Learning - Five steps for engaging students with inquiry based research. This is very appropriate for STEM program. This is an article by Sam Northern in Knowledge Quest, August 30, 2019.
Citing Medicine - an NML
style guide which has a section on citation style for internet sites including blogs and wikis.
Assignment Calculator - This site is designed for the use of
college students at the University of Minnesota. The student inputs the dates of the start and end of the assignment and the
topic. A schedule of work is generated along with suggested resources to use. This might be useful for high school students, too.
This site is by the University of Minnesota Libraries.