Web-based discussion tool (not a full-fledged learning management system, but you can link to Piazza from your LMS, including Blackboard, Moodle, and Coursera) that allows student to ask questions and interact with instructors and other students in a public space. A wiki style format enables collaboration in a single space and features LaTeX editor, highlighted syntax and code blocking. Questions and posts needing immediate action are highlighted and instructors endorse answers to keep the class on track. Anonymous posting encourages every student to participate. Subjects include computer science, biology, chemistry, economics, psychology, engineering, mathematics, and physics. Once in a subject area, you can view what professors from where are teaching or answering questions on what.

This is a great tool for students looking to get extra or more in-depth help beyond the classroom.

Companies can use Piazza for recruiting college students, and it is this function for which users pay.

The Annotator allows you to analyze any block of text created by other authors. You may use virtual markers to highlight important passages, questions, thoughts, or add comments.

Project Pad is web-based system for media annotation and collaboration for teaching and learning and scholarly applications. Project Pad provides tools for browsing and working with audio, video, and images from digital repositories. The user may organize and annotate excerpts within their own "online notebook." Available as a standalone web application or set of Sakai tools.

StoryKit allows you to create an electronic storybook.

Exploratree is a web-based library and editing application for "interactive thinking guides," which are templates useful for mind mapping, brainstorming, planning, and visualization. Originally developed for use in the classroom, to help students refine and focus their ideas, as well as manage plans to further their investigation. Thinking guides can be edited, printed, and downloaded directly from the browser.