Windows Stable Installers
Windows Development/Unstable Installers
Linux Binary Packages
Fedora
Fedora repos are hosted in a COPR repository. Note this package requires mp3gain which can be found in the rpmfusion repos.
Fedora 25+:
sudo dnf install dnf-plugins-core
sudo dnf copr enable openkj/OpenKJ-unstable
sudo dnf install openkjtools
Ubuntu 16.04+ (and derivatives like Mint or Elementary OS)
sudo add-apt-repository ppa:openkj/unstable
sudo apt-get update
sudo apt-get install openkjtools
Source code
Source code can be found on
GitHub