Calendarix - Calendarix is a powerful and easy to use web-based calendar that runs on PHP and MySQL.
RoomForTea - A female-friendly housing network in London, UK.
Cronofy - Unified Calendar API for developers
Travel Diaries - Create your own travel diary to capture your experiences
Campaign Calendar - Campaign Calendar by Bracket Labs builds a marketing calendar from your Salesforce Campaigns.
Magpie - Female travelers club - meet women like you when you travel