jcf-linux-64(772 KB) is executable binary file for Linux 64 bit systems.jcf-linux.zip(281 KB) is compressed file containing JCF executable and config file for Linux 64 bit systems.jcf-osx-64(961 KB) is executable binary file for Mac OSX 64 bit systems.jcf-osx.zip(336 KB) is compressed file containing JCF executable and config file for Mac OSX 64 bit systems.jcf-win-32(524 KB) is executable binary file for Windows 32 bit systems.jcf-win-64(733 KB) is executable binary file for Windows 64 bit systems.jcf-win.zip(481 KB) is compressed file containing JCF executable and config file for all Windows systems.jcf.xml(11 KB) is Lazarus' default JCF configuration file for all systems.
After you download any of them, you should rename the executable file into simply jcf for ease of use.