I am a Horde Core developer and one of the founding members of Horde LLC.
My Horde contributions are primarily on the LDAP integration, WebDAV/CalDAV functionality, the Horde_Cache SQL driver and service management applications (Beatnik, Vilma, Operator). I also administer the Horde Developer servers.
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"The Horde project is hands down the most feature rich, customizable, versatile, and extensible web-based e-mail client on the internet today. A totally open source project, Horde provides more functionality from web-based e-mail than anything else on the market. Horde is presently the granddaddy of all webmail software as far as content, capability, and security are concerned."