Collaboration tools

What best describes your need:

• I want to work with another person on a document, map or drawing
• I want several people to work on the same document, map or drawing
• I want many people to comment on the same document, but not edit it
• I want to have a place that my course can share notes on the same topics
• I want my students to be able to work together online
• I want to see, talk to, and share screens with someone in a remote location
• I want to see, talk to, and share screens with several people in various remote locations
• I want to invite a guest speaker into my classroom