I guess you could say that the Plus edition is a copy of WebToolz on steroids. Generally, it caters for larger organisations that need to publish a lot more content.

Features	WebToolz	WebToolz Plus
Web-based management
WYSIWYG editor
Dynamic menus
CSS stylesheet support
Advanced templating system
Online image editor
Media manager
Sideblocks manager
Meta data
Internal search engine
Page view tracking
Contact us form
Polls
Administrator management
Discussion forum
F.A.Q. manager
Picture gallery
Broken hyperlink notification
Multi-language capabilities
Member registration
Privileged content