What is the best open source for .NET controls? [closed]

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Does anyone know the best opensource for .NET controls? With Dev Express, Telerik, they so cool, but they are commercial version.

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You can already find quite a lot of interesting stuff on Codeplex. And of course there's no stopping yourself to create your own custom controls for your application. Take a look at these tutorials: Developing Custom ASP.NET Server Controls..

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How about Mono’s re-implementation of Windows Forms?