Custom Plug-Ins, developed by various members of the community, are available for JED which expand on the features that come with the application. Most of these plug-ins automated tedious tasks that would have taken the developer a long time to do themselves.
Controversy has always existed between which application for JK community level development was better (JED or JKEdit).
ZED is a modified version of JED developed by ZeqMacaw after Alexei Novikov released the source code to his JED application. ZED contains bug fixes and features, so it is considered a continuation of the JED application development.