ciaaw is a Fortran library providing the standard and abridged atomic weights, the isotopic abundance and the isotopes' standard atomic weights.

• Man pages: https://github.com/MilanSkocic/ciaaw/tree/main/doc
• Documentation: https://milanskocic.github.io/ciaaw/
• Examples: https://github.com/MilanSkocic/ciaaw/tree/main/example
• Source code: https://github.com/MilanSKocic/ciaaw
• Python wrapper: https://pypi.org/project/pyciaaw
• Binaries: https://github.com/MilanSkocic/ciaaw/releases

It covers:

• SAW: Standard Atomic Weights.
• ICE: Isotopic Composition of the Element
• NAW: Nuclides Atomic Weight.