ESXi Embedded Host Client is a tool for Web management of ESXi hosts, even the free version and without vCenter. ESXi Host Client can be easily installed via SSH on the ESXi host to control and offers a Web Client complete with all the features available with the classic Windows vSphere Client.

It can be very handy in those situations when there is the need to manage an ESXi host on a non-Windows client; it's a recent project with an on-going development, several bugs have been identified on ESXi 5.0 and 5.5

Download and documentation here.