Nodeclipse/chromedevtools are modified "Google Chrome Developer Tools for Java" http://code.google.com/p/chromedevtools/ . They make the largest and oldest part of codebase.
From Node wiki
First, there is new "Nodeclipse":http://www.nodeclipse.org/ project, that lets to create, edit and debug Node.js application in fully integrated way. It uses modified "Eclipse debugger plugin for V8":http://code.google.com/p/chromedevtools/ (with some bugs below fixed). The usage may be simplified, but the principle stays the same.
"Eclipse debugger plugin for V8":http://code.google.com/p/chromedevtools/ can be easily used to debug node scripts. (On OSX 10.5 the plugin requires an Eclipse 64 bit Version, started with Java SE 6). The V8 engine provides debugging support by enabling attachment of the remote debugger on a TCP port (5858 is node's default).
We use following plugins and features.