Pimero

Pimero is a comprehensive personal information manager that lets you write down pending tasks, meetings, dates, and other events.

The interface shows a calendar displayed by month, days, and hours. On it you can see all the events you have planned.

The free version can't be used to manage projects, since it only allows one user account. That said, you can still use other features, like the task manager, contacts, and events.

The interface has several different layouts: day to day, work week, weekly, and monthly.