Official CyanogenMod Nightlies support has arrived for the Amazon Kindle Fire HD 7″ and 8.9″. Currently the builds show up as experimental, but regular nightlies are set to be released starting today. These ROMs are running CyanogenMod 11.
As is the usual case with ROMs on Android, users should exercise extreme caution. Sometimes these files aren’t stable, although sometimes they are. Users should make sure that they know what they’re doing before they attempt to install anything.