Sitellite 4.2 comes in several flavours, each with their own strengths: Community Edition, Professional Edition, and Enterprise Edition.  Below are some of the advantages of the Professional Edition over the basic Community Edition.  Click on the links above for more details.

• Xed 2 WYSIWYG editor - powerful and elegant cross-platform in-browser word processor
  • Link manager with page, bookmark, and file selectors
  • Clean document in place, removes invalid HTML
  • Full-screen editing mode
  • Edit properties of any tag, including class and id selection from global CSS
  • "Box Chooser" wizard for inserting dynamic content (forms, polls, news, galleries, etc.) into any page
  • Xed content templates to help promote consistency of page layouts
  • Multi-lingual spell checker to keep content correct and accurate
  • Contextual right-click menu for quick access to common operations
  • 25-level undo/redo history
• 10 exclusive add-ons:
  • SiteBanner ad campaign manager
  • SiteEvent events calendar
  • SiteGallery galleries and slideshows
  • SiteLinks link directory
  • SiteMailer email marketing
  • SitePresenter online presentation builder
  • SiteSearch Pro search engine
  • SiteStreamer audio publisher (m3u, podcast, etc.)
  • SiteStudy case study publisher
  • SiteTracker traffic analyzer
• Right to protect your work and not have to share it as Open Source (make your own commercial software based on Sitellite)
• Warranty from a responsible software provider: Free bug fixes and security updates for life
• Unlimited user accounts (no per-user licensing!)
• High-quality Open Source-based content management system
• Flexible and well-documented web application framework
• User-centric administrative interface
• Standards- and accessibility-compliance aids built into the new SiteTemplate editor
• New graphical install wizard, checks your server for a variety of compatibility tests
• Open Source community, including tutorials, API references, and discussion forums
• Full source code with full freedom to modify and customize the software
• Complete end-user manual