SendLater - Email scheduler for Mac Mail.
Greasemonkey - Customize the way a web page displays or behaves, by using small bits of JavaScript.
Assistant.to - GoToMeeting. Put your GoToMeeting link in the Assistant. to "Location" field. Once the recipient selects a time, you will both receive an invite with a unique GoToMeeting link.
Site Connector - Reuse data from one website on another.
Shortwave - Email smarter & faster with a reinvented experience for your Gmail
Launchlet - Customize the web with JavaScript or CSS