What it is:  Meeting scheduling tool 

How it works:  With this tool, you can poll others for when they are available to meet to find a time that works for everyone. Comments can be shared, but this ability is limited. 

How it might be used in education:  This could be used by students to set up meetings with each other when working on a group project.

Pros:  Not language-specific. Basic level of service is free.

Cons:   Limited use outside of scheduling.

Find it: http://www.doodle.com/