Useful resources
Schema.org & CodeMeta tools
Schema.org provides a structured metadata schema for many resources on the Internet.
It also comes with an online validator for your JSON-LD file.
CodeMeta extend the schema.org with specific terms for software.
CodeMeta generators and converters
These tools can help you either generate your codemeta.json from scratch or maintain it automatically from other metadata sources. You may also visit the codemeta website for more.
https://pypi.org/project/CodeMetaPy/ - generate codemeta files for Python packages
https://github.com/ropensci/codemetar - generate codemeta files for R packages
https://con.github.io/tributors/ - allows you to update a codemeta file with contributors information from different sources
https://github.com/citation-file-format/cff-converter-python - converts CITATION.cff to several formats, including CodeMeta and Zenodo.
https://github.com/caltechlibrary/codemeta2cff - converts codemeta to CITATION.cff using GitHub actions
https://github.com/caltechlibrary/datatools - converts codemeta to CITATION.cff with a command-line tool
You can also generate your codemeta.json file online using the OSSR Codemeta generator:
The metadata jungle
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Zenodo
Developers help: https://developers.zenodo.org/
Search guide: https://help.zenodo.org/guides/search/