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Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
Google Calendar - Spend less time managing your day & more time enjoying it
Roundcube - Web-based IMAP email client
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Calendar Lock PEA - Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.