Open Source Data Applications.

Office.

Open Office http://www.openoffice.org

Staroffice http://www.staroffice.org

Mail.

MTA.

sendmail http://www.sendmail.org

Exim. http://www.exim.org

Courier-MTA http://www.courier-mta.org

Postfix http://www.postfix.org

Qmail http://www.qmail.org

Mailstore.

Courier-IMAP http://www.courier-mta.org/imap/

MUA.

Evolution http://www.gnome.org/projects/evolution/

Horde (a web based email client) http://www.horde.org

Anti-Spam.

Spamassassin http://spamassassin.apache.org

ClamAV http://www.clamav.net

Calendering and Groupware.

Evolution http://www.gnome.org/projects/evolution/

Phpgroupware http://www.phpgroupware.org

Openxchange http://www.novell.com/support/products/openexchange/

Opengroupware http://www.opengroupware.org

Web Services.

Browsers.

Firfox http://www.mozilla.com/en-US/firefox/

Web Servers.

Apache http://www.apache.org

Zope http://www.zope.org

Content Managment Systems.

Joomla http://www.joomla.org

Drupal http://drupal.org

Document Managment

Alfresco Document Manager http://www.alfresco.com/

Tutos http://www.tutos.org

Databases.

Mysql http://dev.mysql.com

Postgress http://www.postgresql.org/

Operating Systems

Fedora http://fedora.redhat.com

Debian http://www.debian.org/

CentOS http://www.centos.org/

FreeBSD http://www.freebsd.org

Slackware http://www.slackware.com

Suse http://www.novell.com/linux/

T2 http://www.t2-project.org/

Security.

OpenSSH http://www.openssh.com

Proxy Server.

Squid http://www.squid-cache.org

Firewall

Snort http://www.snort.org

Shorewall Router and Firewall http://www.shorewall.net

IPCop http://www.ipcop.org/

Trustix http://www.trustix.org

pfSense http://www.pfsense.com/

Router

XORP http://www.xorp.org

Vyatta http://www.vyatta.com

Network Monitoring

Nagios http://www.nagios.org/

OpenNMS http://www.opennms.org/

S.M.A.R.T. http://smartmontools.sourceforge.net/

ZenOSS http://www.zenoss.com/

Virutal Private Networking

Openvpn http://openvpn.net/

Remote Access

OpenSSH http://www.openssh.com

scp http://www.openssh.com

TightVNC http://www.tightvnc.com/

File Storage.

FreeNAS http://www.freenas.org/

Openfiler http://www.openfiler.com/

NFS http://nfs.sourceforge.net/

Samba http://www.samba.org/

Backup

Amanda http://amanda.zmanda.com/

System Admin.

Webmin http://www.webmin.com/

DNS

Bind http://www.isc.org

Directory Services.

OpenLDAP http://www.openldap.org/

Window Emulations.

Wine http://www.winehq.com/

ReactOS http://www.reactos.org/

Virutulization.

Xen http://www.xensource.com/

Win4lin http://www.win4lin.com/

Frameworks.

Seagull PHP Framework http://www.seagullproject.org/

CakePHP http://www.cakephp.org/

Eclipse http://www.eclipse.org/

ERP

Openbravo http://www.openbravo.com/

Compiere http://www.compiere.org/

Opentaps http://www.opentaps.org