The S Running Log (SRL) is a cross-platform graphical running log. It runs on Windows 95 and up, Mac OS X 10.3 and up (PPC or x86), and any UNIX or UNIX clone with the X Window System. Written in Scheme (MrEd), it is portable to any platform PLT Scheme has been ported to as a native executable or interpreted code. It saves all information in ASCII s-expression-based flat files for easy portability and maintenance.
One of the biggest advantages of SRL is its portability. It is easy to create a USB drive you can carry around in your pocket, plug into any computer, and use as a running log.