HTML5 remote desktop clients are browser based remote desktop clients that
run without requiring a browser plugin (typically by using the WebSockets and the
element). These are installable gateway server programs
that deliver an HTML5 experience to any compliant browser without requiring a plugin
to be installed.
If you're looking for clients, go to the Remote Desktop Clients index.
ThinVNC – an open source HTML5 remote desktop client
RemoteSpark Spark View
In case you're interested in the inner workings of HTML5 clients, here's an article on the topic: How HTML5 remote desktop clients work
You can find information about RDP servers for other OS's at the Remote Desktop Servers topic.