Bynari InsightServer for Linux on x86 and zSeries: www.bynari.net/insightserver.html
Cyrus IMAP: asg.web.cmu.edu/cyrus
Exchange Server Replacement HOWTO: www.arrayservices.com/projects/Exchange-HOWTO
Exim: www.exim.org
OpenLDAP: www.openldap.org
