This repository holds validation cases against similar poliastro software. Several alternatives are available:
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Vallado: a collection of routines published in the book "Fundamentals of Astrodynamcis and Applications", by David A.Vallado. Software has been coded in different programming languages and can be found in Celestrack webpage.
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Orekit: this software is open-source and coded in Java. However, it has a Python wrapper, which makes it ideal for validation testing cases since it is very similar to poliastro. Official web page is hosted here.
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GMAT: it is an open-source NASA software which stands for General Mission Analysis Tool. Its source code is written in C++ and makes use of OpenGL for visualization purposes. Official web page is hosted here.
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AGI-STK: the reference software in the industry which stands for System Tool Kit. Although it is extremely advance and powerful from the point of view of orbital mechanics, its non open-source nature and the fact that only runs in Windows OS, are disadvantages for validation testing purposes. Official web page is hosted here.