Welcome to CoolProp
CoolProp is a thermophysical property database and wrappers for a selection of programming environments.
It offers similar functionality to REFPROP, but CoolProp is open-source and free.
It was originally developed by Ian Bell, at the time a post-doc at the University of Liege, in Liege, Belgium.
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CoolProp has flexible licensing terms: Commercial - ok! Academic? - ok! 
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For Python, get the latest release via pip install coolprop 
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... other binaries are available from SourceForge 
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There is also a bleeding edge nightly build of the development version.
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The documentation is available for the latest release and the development version
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For any kind of question regarding CoolProp and its usage, you can ask the CoolProp Discussions
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... you might also find answers in our FAQ
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If you found a bug or have an issue that requires the developers to become active, please file an issue in our issue tracker
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Contributions to this project are welcomed and encouraged! If you wish to contribute bug fixes, patches, or new features, wrappers, or material properties, please submit a Pull Request with your code.
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If you are new to Git and Github, please see the CoolProp Wiki for guidance on becoming a contributor to the project.
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Have a look at the coverity stats 