Open Source alternatives to proprietary Enterprise software

This list is a collaborative effort to build the ultimate list of enterprise software and their Open Source and SaaS alternatives. Feel free to comment and propose names since this is quite an ambitious goal.

Title	Open Source alternative(s)	Saas alternative(s)	Proprietary alternative(s)
ATG Commerce	Magento PrestaShop Drupal Commerce	Demandware Venda	Hybris
AutoCAD 2009	BRL-CAD Archimedes QCAD Community Edition	Floorplanner.com
BlueKiwi	Drupal Commons Elgg PeopleAggregator	Yammer Google Sites CubeTree	Jive Engage
BMC IT Service Support for the Midsized Business (formerly Magic)	RT - Request Tracker OTRS - Open source Ticket Request System	ZenDesk
BMC Remedy for IT Service Providers	OTRS - Open source Ticket Request System RT - Request Tracker	ZenDesk
BMC Remedy IT Service Management	OTRS - Open source Ticket Request System RT - Request Tracker	ZenDesk
Bonjour	Avahi
Business Object Data Integrator	Kettle Talend Open Studio Apatar	LucidEra	Powercenter
Confluence	xWiki Drupal MindTouch Core	Google Sites	Jive Engage Sharepoint 2010
CubeCart	OSCommerce Magento ZenCart
DieselPoint Search	Apache Lucene Carrot2 Xapian Apache Solr	SearchBlox Cloud Edition	IDOL Server FAST Enterprise Search Platform Velocity Search Platform Exalead CloudView
Dimdim	VMukti Ekiga
Documentum	Alfresco Nuxeo 5	SpringCM	Filenet Sharepoint 2010
Endeca Information Access Platform	Apache Lucene Pentaho		Velocity Search Platform IDOL Server FAST Enterprise Search Platform
EnterpriseSpigit			Innovatik Idea Central Software Ideascale
Exalead CloudView	Apache Lucene Carrot2 Apache Solr	SearchBlox Cloud Edition	IDOL Server FAST Enterprise Search Platform Velocity Search Platform
FAST Enterprise Search Platform	Apache Lucene Carrot2		IDOL Server Velocity Search Platform
Google Search Appliance (GSA)	Apache Lucene		IDOL Server Endeca Information Access Platform Velocity Search Platform
HEAT Product Suite	OTRS - Open source Ticket Request System RT - Request Tracker		BMC IT Service Support for the Midsized Business (formerly Magic) BMC Remedy for IT Service Providers
Hybris	PrestaShop Magento	Venda Demandware	ATG Commerce
IBM WebSphere Portal	Liferay JBoss Portal	Google Sites	ATG Portal Oracle WebLogic Portal Sharepoint 2010
IDOL Server	Apache Lucene		Velocity Search Platform
Internet Explorer	Google Chrome Firefox		Opera
JIRA	Mantis Bugzilla Redmine OTRS - Open source Ticket Request System	ZenDesk JIRA
Jive Engage	MindTouch Core Drupal	Google Sites	Sharepoint 2010 Confluence
Livelink ECM	Alfresco Nuxeo 5		Documentum Sharepoint 2010 Filenet
Microsoft Dynamics CRM	Sugar Open Source OpenCRX
Microsoft Project	Open Workbench OpenProj	Campfire
Microsoft Search Server 2008	Apache Lucene Apache Solr LucidWorks for Solr		IDOL Server Endeca Information Access Platform Velocity Search Platform
Micrososft SQL Server Integration Services -SSIS	Talend Open Studio Kettle Jitterbit		Powercenter
MQSeries	ActiveMQ JbossMQ
Norton Ghost	Clonezilla
OmniFind Enterprise Edition	Apache Lucene		Endeca Information Access Platform IDOL Server Google Search Appliance (GSA)
Opera	Firefox Google Chrome Konqueror Flock		Internet Explorer Safari
Oracle 10g	MySQL 5.x Community Edition PostgreSQL
Oracle 11g	MySQL 5.x Community Edition PostgreSQL
Oracle Weblogic Application Server	Jboss Application Server Tomcat Geronimo WebSphere AS Community Edition		Websphere Application Server NetWeaver Web Application Server
Oracle WebLogic Portal	Liferay eXo Platform Drupal	Google Sites	IBM WebSphere Portal Sharepoint 2010
PHPizabi	Drupal Elgg PeopleAggregator
Powercenter	Talend Open Studio Kettle Apatar	LucidEra	Business Object Data Integrator
Safari	Google Chrome Firefox		Internet Explorer Opera
SearchBlox	Apache Lucene Carrot2		Exalead CloudView Velocity Search Platform Microsoft Search Server 2008
Sharepoint 2010	JBoss Portal Drupal Alfresco	Google Sites	Oracle WebLogic Portal IBM WebSphere Portal
SiteCatalyst	awstats Piwik	Google Analytics
Top Braid Composer	Protégé		ITM T3 Synaptica
Track-It	Mantis Bugzilla		BMC IT Service Support for the Midsized Business (formerly Magic) JIRA
Trident	Gecko Webkit KHTML
Unica	awstats Piwik	Xiti Google Analytics Woopra	SiteCatalyst
Velocity Search Platform	Apache Lucene Carrot2		Exalead CloudView Microsoft Search Server 2008
WebTrends	awstats Piwik	Xiti Google Analytics Woopra	SiteCatalyst