Diigo is a social bookmarking tool that allows you to tag, highlight and add sticky notes to webpages and PDFs. For educator accounts: diigo.com/education
Collect web content on any topic and turn it into beautiful web page to share with anyone.
Collections on this platform are organized as vertical timelines. This is an especially nice option if you want students to experience your collection in a specific order.
The Toby browser extension allows you to organize open browser tabs into shareable collections.
Organize your resources in an online digital binder.