This is a IHC viewer custom component for Home Assistant.
NOTE: Version 2.x requires the new IHC integration - Read about it here If you have the build in IHC integration in Home Assistant - you should not update IHCViewer.
Read more about on my blog here
To use it go to Configuration|Integrations and click the add integration. Find the IHCViwer in the list.
And you MUST have IHC configured in Home Assistant.