Tinkercad: If you made a 3D object designed in Tinkercad online public, you can get its embed code.
Scribd: Upload a PDF and get embed code to insert it on your webpage. Hyperlinks in the PDF are clickable in the Scribd widget.
Book Creator: Digital books made with Book Creator for iPad, Android, or Windows can be shared online with a free Book Creator Teacher Account. The embed code displays the book's cover and title as hyperlinks that open the book in a new tab.
Sway: Each project you make in Microsoft Sway has embed code. Get the code by clicking the Share icon.
Nearpod: Lessons in Nearpod can be embedded. Find the embed code by clicking a lesson's Share button.
Padlet: Padlet walls can be embedded. Just be sure to turn on Moderation (by clicking Share) for the wall so that you can approve posts before they are viewable by everyone. Get the embed code by clicking a wall's Share button and then choosing Share/Export/Embed.
Buncee: Buncee provides a multipage canvas where you can add photos, drawings, text, YouTube videos, and weblinks. The paid version allows for audio recordings.
JuxtaposeJS: Compare two images by dragging a slider. To create the widget, you'll need the URLs of two images that are the same size. If you don't have a URL for the images, you can choose images in your Dropbox account. JustaposeJS is great for highlighting changes over time (growth of a city skyline, regrowth of a forest, etc.) or before and after images that old and new versions of a photo or graphic.