Assistant.to

Chrome plugin for Gmail that let's you send a visual snapshot of your calendar availabilities by email

Description

Assistant.to simplifies the back and forth of meeting scheduling. It lets users insert meeting details and availabilities into emails so that the recipient simply has to select his/her preferred time. Once a time is selected, the meeting is added to both participants' calendar, including meeting details such as duration and location. It is currently only available for Gmail and comes as an extension to your web browser.

Price
FREE

Completely free :)