TORO is a kernel written as a RTL library for FPC compiler. The application is compiled without Operative System layer in a unique binary.
Hence, The application can run alone in the system with a minimal kernel services like multithreading, VFS, Stack tpc-ip and more.
It is distributed under GNU/Linux General Public License.
I think is a really powerful project to understand how an Operative System works in a amazing teaching language as Pascal is. Very useful documentation and sources.