I was searching for a Velocity editor plugin for Eclipse Luna but I could not find any. I found couple of editor plugins like:
You can install support for 2.0 style plugins using Help > Install New Software.
Select the 'Eclipse Project Updates' site (http://download.eclipse.org/eclipse/updates/4.4).
You will find 'Eclipse 2.0 Style Plugin Support' in the 'Eclipse Tests, Examples and Extras' section.
Install it.
After, simply install Veloeclipse or other old "2.0 style" plugin