Fantastical - New calendar and event list App for Mac. The natural language of the Fantastical is not only very expressive but also intelligent that enables you to write the style of your own in any specific format.

Plancake is a PHP/MySQL based personal organizer and to-do list that is built on the Symphony , the enterprise-level Object Oriented PHP Framework. Plancake - GTD based personal organizer and online to-do list

Online collaborate as well as project management is provided to the users of Doolphy. Several tools that are quite handy are provided by this site that includes an interface that is pretty easy to use, no user limits, file sharing, milestone management and hour logging.