Doodle: easy scheduling | 21st Century Tools for Teaching-People and Learners | Scoop.it
Doodle helps scheduling meetings and other appointments. Doodle is simple, quick, free and requires no registration. Simply set up a poll, send a link to all participants, watch progress online, and finally choose the most suitable date.

 

 

Gust MEES: great for scheduling Twitter Chats e.g.

 

Read more:

http://doodle.com/?locale=en