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The Blue Obelisk Data Repository lists many important chemoinformatics data such as element and isotope properties, atomic radii, etc. including references to original literature. Developers can use this repository to make their software interoperable.
The Chemical Structures Project is a set of 3D structures of molecules in CML format. Each file contains also some physical properties, which can be access using a web browser or a CML file reader.
The CheckCML project is a collection of modules for the production and checking of chemical experimental data represented as CML. The core CheckCML library provides classes for the checking process; tools such as OscarData allow for the production of CML