Free software, including apps that are being temporarily offered for free, during social distancing/remote learning efforts:
http://www.amazingeducationalresources.com/

Anyone who has a disability and uses a Mac, wants to buy one, or who teaches or assists others with disabilities who use a Mac can benefit from Apple's list of Accessibility features.

UsabilityFirst provides a helpful list of the various types of accessibility aids.

This helpful article discusses the pros and cons of peer teaching.

Informative article describing the benefits of peer teaching.

When I've thought of the Khan Academy website, I used to think of the great deal of content there that is focused on Math and Science, with smaller sections for History and Economics. There is a much smaller but very useful section of the website focused on Grammar.

The Big6 model is designed to help build information problem-solving and decision making skills, and is "completely transferable to any grade level, subject area, or workplace."

Larry Ferlazzo is an ELL teacher who has amassed a huge collection of resources including his "Best Of…" lists. There are a lot of good ideas here, not just for ELL/ESL teachers.

The David Rumsey Map Collection is a great resource for historical maps, and the Georeferencer feature is a cool way to overlay historic maps over a modern map and adjust the opacity to compare the two.

For those who haven't explored it yet, Google Earth's Voyager feature is a great resource for geography and mapping activities to integrate into lessons. (Launch in the Chrome browser).

LRNG is an organization who works with cities and organizations to connect students' learning with career opportunities, and to prepare them for life and work in the modern economy, by providing guidance and access to local and national opportunities, peers, and mentors.

The U.S. Department of Education, Office of Educational Technology published a 2017 update to their 2016 National Education Technology Plan Update (NETP): Reimagining the Role of Technology in Education: 2017 National Education Technology Plan Update. The Director of the Office of Education Technology at the time, Joseph South, noted in the report, " Feedback from our stakeholders indicates that the previous five year update cycle was not frequent enough. In response, with this 2017 update, we commence a pattern of yearly, smaller scale updates to the NETP to better account for the pace of innovation in the field."

This page on the Educause website offers a collection of Acceptable Use Policies (AUPs) from a variety of educational organizations, as well as articles and papers about best practices in creating AUPs.

The United States Department of Education's Office of Educational Technology has published a resource, Building Technology Infrastructure for Learning, that offers practical and actionable guidelines for educators and school leaders to help them provide Internet access to learners and make decisions regarding technology services. The guidebook is an excellent resource for anyone needing to understand or to create an acceptable use policy (AUP).

Similar to the Common Core, the U.S. Department of Education's Office of Vocational and Adult Education has published College and Career Readiness Standards for Adult Education: https://lincs.ed.gov/publications/pdf/CCRStandardsAdultEd.pdf

I found Purdue OWL's article on essay papers, especially links to the four main types of essays, to be helpful in creating an essay lesson. https://owl.english.purdue.edu/owl/resource/685/1/

I've used the Purdue OWL site for years, to look up questions about citations and references. I learned recently that they also have a collection of helpful videos (vidcasts): https://owl.english.purdue.edu/owl/resource/948/1/

Have you checked out the Boise State University Career Center's page: Skills Critical for Employability?
https://career.boisestate.edu/makecollegecount/skills-critical-employability/
Not only is it a resource for our own professional development as BSU students, it's also a resource for our teaching practice when we are trying to determine the best ways to teach our students employability skills.

If anyone uses Lynda.com tutorials for yourself or with your students, it's free if your local library is participating in their free library program. Where I live, in Colorado, any state resident can get a free Lynda.com subscription through the Denver Public Library system, and lots of other towns in Colorado also have their libraries participating. Here's a press release about it: https://www.lynda.com/press/pressrelease?id=4063