Overview - Orekit - Orekit Forge
OREKIT is a free low level space dynamics library written in Java. It provides basic elements (orbits, dates, attitude, frames, ...) and various algorithms to handle them (conversions, analytical and numerical propagation, pointing, ...).
It the FAQ it is mentioned that the Two Line Element (TLE) package is well validated, even some errors in the original Fortran code from NORAD were found.
Mon Oct 20 19:12:45 2014 - permalink -
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https://www.orekit.org/forge/projects/orekit