open source netbeans platform projects that I can use?

I've looked at sourceforge and other places for an example netbeans platform 开发者_StackOverflow中文版project source code but couldn't find any besides the Pain netbeans platform app that comes included in the IDE.

I would recommend that you start at the 'NetBeans Plugin Portal'. Many of the plugins have a link to their home page... which often provides access to the source code.