[Lilux-help] Open Source alternatives

Good morning everyone. As this list has been slow recently, I thought it might be nice to get a discussion started about Open Source equivalents or replacements for common proprietary software. It might be interesting to capture the results of this thread on the Lilux web page to help new comers out. Similar to our old distribution matrix. So, here goes: What open source applications are available to replace commonly used proprietary applications. I am primarily thinking about Linux in an enterprise environment, but there is no need to limit ourselves. I'll get us started, please feel free to add or amend as you see fit. End USer PC Software: Proprietary Open Source ------------------------------------------ MS Office OpenOffice MS Visio Dia? Outlook Evolution Mindmanager Freemind MS Project Internet Explorer Firefox Server Based Software: Proprietary Open Source ------------------------------------------ VMware Xen/KVM (Does anyone know a good open source VM management package that works similarly to Vmotion?) HP Open View Nagios/OpenNMS Systems Management Server Exchange Server Exchange Webmail Squirrel Mail SharePoint Server SQL Server MySQL/PostGRE SQL Anti-Virus SPAM Filters Web Security Filters Another area to think about: What management software exists for managing a large number of devices? Think about patch management, IP Address management, software management (installing/uninstalling software on a large scale), security management.... Have fun! Mike