From where i can download Wiki Editor?

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Hi All, I am looking for a freeware Wiki Editor. This means I need to tool create article like Wikipedia. I had tried to search on the net and found TinyMCE. But I do no think that this is relevant editor for the purpose. Does any one knows a reliable Wiki Editor. Please provide the link for the same. And also what are the features of the tool and other than editing text what more does it offers to do. Thanks in advance.