Just found some great end-user solution website, I want to share with you

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http://www.bitsofsharepoint.com/ExamplePoint/Site/Calendar.aspx provide bit source of javascript builder

http://usermanagedsolutions.com/SharePoint-User-Toolkit/default.aspx user managed toolkit

https://www.nothingbutsharepoint.com/sites/eusp/Pages/default.aspx jQuery source site

There are lots of the other sources on the web.