In his own words, ESXi Simple Web provides the following:
Basic controls straight from the esxi host in the browserWei's ESXi Simple Web definitely looks prettier and from what I can tell, it looks to be using Bootstrap, a popular web front-end framework for the UI. The web interface talks to the vSphere MOB which basically communicates to the vSphere API for providing the summary details and basic VM operations.
This allows you to run basic operations against the ESXi MOB api from a simple web interface straight from the ESXi host without the need for the vCenter web client.
Inspired by virtuallyGhetto's Ghetto webAccess for ESXi
Github repo. Once downloaded, you just need to extract the content and SCP the "web" directory over to the ESXi host under /usr/lib/vmware/hostd/docroot
Here are a couple more screenshots of ESXi Simple Web running on my Apple Mac Mini with ESXi 5.5:
If you are interested in adding additional functionality, you can contribute by sending a pull requests to esxi-simple-web Github project.