Cronofy - Unified Calendar API for developers
Evercontact - Your contacts always up to date and automatically with Evercontact.
Calendarix - Calendarix is a powerful and easy to use web-based calendar that runs on PHP and MySQL.
CONTACTBOX - CONTACTBOX combines the simplicity of an address book with effective functions of a CRM system.
Campaign Calendar - Campaign Calendar by Bracket Labs builds a marketing calendar from your Salesforce Campaigns.
CRM-gx - Contact Management