Library to draw multiple timespans like in Outlook

Question

I am implementing an application that displays an overview of the availability of a limited number of persons. In some sense this is similar to Outlook, if you have a combined view on several people's calendars. In fact it shall become some sort of replacement of Microsoft Outlook, because Outlook always displays short meetings but I'm interested only in long-term (week-wise) absences.

These would be the steps in my application (most of that I will implement myself):

1. get all items from Outlook calendars of the affected persons, plus other sources like personal calendars (Gmail etc.)
2. apply filters, especially: remove all items that are shorter than 2 days
3. display the remaining items on a very rough scale (month to year instead of days): that's where the library comes into play

Here's a graphical representation of what I need:

That library or component must

• support .NET (C#)
• support zooming
• support scrolling
• support bars in different colors
• be gratis (free of cost)
• be open source and actively maintained
• allow commercial use

Answer 1

Essential Chart for WPF can support this kind of display using the column range chart type- only requirement it won't be able to meet is that it is not open source. There is a community license though if you qualify.

Sample application code

• support .NET (C#) : Yes
• support zooming : Yes
• support scrolling : Yes
• support bars in different colors : Yes
• be gratis (free of cost) : Yes (Community license)
• be open source and actively maintained : Not open source
• allow commercial use : Yes

The whole product is available for free through the community license if you qualify (less than 1 million USD in revenue).

Note: I work for Syncfusion.