Lightning is an extension for Mozilla Thunderbird that adds an integrated calendar to the e-mail client. It is based on the standalone Mozilla Sunbird calendar application. Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.
Mia for Gmail (was Notifier Pro for Gmail) is a desktop Gmail client which sits politely in your menu bar.
