DyMat contains some modules to read and process the result files from Dymola and OpenModelica with Python. A script is included that will help you to browse and export the contents of these files to other formats.
Both simulation systems save their results in regular mat-files, but use a special variable structure to store the data efficiently. An easy way to access the data is MATLAB, but some people (like me) don't have it or don't want to use it.
The homepage of this package is http://www.j-raedler.de/projects/DyMat.