RTLinuxFree is a free, open-source implementation of FSM Labs' real-time RTLinuxPro, which now supports the Linux 2.6 kernel. RTLinux is a split operating system with a real-time and a conventional Linux component. Real-time applications run with minimum system overhead. RTLinuxFree is available for download from the RTLinuxFree Web site. RTLinuxPro includes commercial support and additional software and services.