I want to know what are the eclipse version will support the windowbuilder and its available online for online installation?
Eclipse Mars and Eclipse Neon supports windowbuilder (I only worked with them, but I suppose every version of Eclipse supports windowbuilder). If you download Eclipse Mars v2, you will have windowbuilder by default. For Eclipse Neon, you must download windowbuilder.
Here is the link where you can find windowbuilder. Just follow the instructions http://www.eclipse.org/windowbuilder/download.php