HTML5 remote desktop clients are browser based remote desktop clients that run without requiring a browser plugin (typically by using the WebSockets and the <canvas> 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

  ThinVNC web site
  The SourceForge project

• RemoteSpark Spark View

  Spark View web site
  Spark View online demo

• Ericom AccessNow

  AccessNow web site
  AccessNow online demo

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.