The SL Libraries (originally from the SL Toolkit but now included in SIMION 8) is a collection of libraries for manipulating SIMION potential array (PA/PA?) files from general purpose programming languages (C++/Python/Perl). These are parallel implementations, each implemented natively in the respective progamming language, and regression tested against a single test suite.
Note: There is also a Lua version available in SIMION 8.1 (see simion.pas). The Lua version has some advantages because it runs inside the SIMION process and requires no additional compiler.