Due to lower demand, other projects have taken priority over FireControl for Linux. That being said, our development team has nearly completed a functional Linux build of the next version of FireControl. The nearly complete build is intended for Debian-based Linux distributions (Ubuntu, Mint, Debian, etc), but there will probably be an available RPM package option for Redhat-based distributions as well.
At this time, we cannot offer a definitive ETA on FireControl for Linux, but it is coming soon. We appreciate your patience!