Integration

Dedicated software

Forums

• FluxBB
• Invision Power Board
• PunBB

Bug tracking systems

• Bugzilla

Newsletter managers

• phplist: PHPList module

ERP

• Microsoft Navision (commercial)
• TinyERP

CRM

• RightNow
• SugarCRM

Advertising

• phpadsnew (integration of phpAdsNew, now called Openads)

Also think about migration from your dedicated software to eZ publish.

WYSIWYG editors

• fckeditor
• tinymce

Libraries / components

• jaxx
• jpgraph
• jQuery
• jupload
• lightbox JS: illightbox2, eZlightbox
• nusoap
• xajax
• Yahoo UI: Smile Calendar, cooldebug ajax node tree browser

Services

• Amazon web services
• Google Analytics
• Google Calendar
• Google Maps
• Google Search Appliance
• Google Sitemaps
• Payment gateways
  • Authorize.net
  • Paynet
  • Paypal
  • Protx
  • Worldpay
• Yahoo maps