Zenodo

Zenodo is a general-purpose open research repository built and run by CERN, the European physics laboratory, on infrastructure funded to outlast any single project. It gives researchers anywhere a free place to deposit and preserve their work, and it accepts almost any file type and any subject: datasets large and small, software releases, reports, figures, and the papers that accompany them.

The defining feature is that every deposit receives a DOI (Digital Object Identifier), a permanent link that keeps resolving even as the underlying storage changes, so citations do not rot. You can browse and download openly, search by topic or by "community" (curated collections around a project or event), and pull records through a well-documented REST API, with an OAI-PMH endpoint for harvesting metadata in bulk. Versioning is built in, so a dataset can be updated while older versions stay permanently citable.

For RAG, Zenodo is a good source of curated, documented research datasets and, importantly, the cleaned and standardised builds of well-known corpora that authors often publish here rather than on a personal server. If a paper introduces a dataset, there is a strong chance the canonical, stable copy lives on Zenodo with a DOI you can cite, which makes it valuable when provenance and reproducibility matter.

The main thing to watch is that Zenodo is a host, not a curator: quality and completeness are down to whoever uploaded each record, and there is no central review of the data itself. Licences are chosen per deposit and range from fully open (CC0, CC BY) to more restrictive terms, so the overall commercial-use position is unclear and you must check the licence on each record before you reuse it. File organisation and documentation also vary widely between uploads. Compared with Kaggle it offers stronger provenance and citability but less community tooling; the two work well together, with Zenodo as the archival source of record and Kaggle as the exploration surface.