UManSysProp is an online facility for calculating the properties of individual organic molecules and ensemble mixtures. Built using open source chemical informatics, the facilities provided are divided according to broad applications.
The code is licensed under the GPL v2 or above. Packages can be downloaded from PyPI. The source code can be obtained from GitHub, which also hosts the bug tracker. The documentation (which includes installation and quick start examples) can be read on ReadTheDocs.