I am trying to install the Eclipse plugin for WSO2 ESB.
I am following the instructions from the Installation Guide but the address http://tools.wso2.org/eclipse/ was not available for the last 5 days.
Are there any alternative links where I can download the plugin?
Yes. The link you are referring to, seems to be outdated. Carbon Studio provides Eclipse based tooling support for WSO2 products. You can find the installation guide for latest version of Carbon Studio here.