Doodle - "Doodle helps you to schedule 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." (https://doodle.com)
Doodle Poll is an online service which you can access from any device with an internet connection.
(Note: The University is not responsible for the content of external websites).