HDSurfer is a system (Plex plug-in + 'proxy' server) that allows you to stream from your HDHomeRun to any of your plex clients. There are still many limitations and other hurdles, hence the ALPHA release, but it's currently in a 'functional' state and being actively developed. There is a README in the zip that should, obviously, be read first.
Developed on: Fedora 19 (should work on other platforms
Plex Server: 0.9.8.18.290-11b7fdd
Current Download: HDSurfer-ALPHA-0.4a.zip (863 KB)
The code will all be posted to github once it reaches a BETA status.