Seesaw: Seesaw is a learning journal where students can each contribute text, images, videos, and files to a portfolio. All students work is kept private unless specifically shared. To share as a widget, click the three dots next to the item and click Share Item. Up pops a box with embed code for you to copy. Thanks to Kristen Brooks for sharing her Woodstock Elementary students' video below. It's embedded from Seesaw.
Mentimeter: Mentimeter is a website that enables teachers to poll students in a variety of ways, and you can embed the results to a question. Question types include multiple choice, short answer, scale, and word clouds. Get the embed code by viewing the results of a question, clicking Present, choosing Settings, and then clicking Share. Read my post about Mentimeter.
Photos For Class: Students and teachers can search through Creative Commons licensed images at photosforclass.com. The site provides a widget so that a copyright-friendly search can be entered on our own website. When images are downloaded through Photos for Class, the citation is automatically attached to the bottom of the image.