DevDocs
DevDocs gathers official documentation from hundreds of projects, such as Python, JavaScript, React, and PostgreSQL, and presents it through a single fast interface. The scraping and packaging code is open source, so you can run your own copy and generate the documentation sets you care about.
Because DevDocs already normalises each source into a consistent structure, it saves you the awkward work of parsing many different documentation formats. You can index the resulting content as passages for a developer-facing assistant that answers questions against current library reference material.
The aggregator itself is licensed MPL 2.0, but the individual documentation sets keep their original licences, so check the terms for any specific project before you redistribute its content.
Related sources
GitHub Public Repositories (GH Archive / GHTorrent)
Two projects that capture public GitHub activity for analysis. GH Archive records the public GitHub event timeline as downloadable hourly archives, and GHTorrent offers a queryable mirror of GitHub metadata. Together they help you mine code, issues, pull requests, and documentation at scale.
Stack Exchange Data Dump
Periodic XML dumps of every site in the Stack Exchange network, including Stack Overflow. Each dump holds questions, answers, comments, votes, and user profiles. One of the richest question-and-answer datasets you can freely download, and a natural fit for building technical support and developer RAG systems.
The Stack v1 / v2
A large source code dataset from the BigCode project, built from permissively licensed code on GitHub with duplicate and near-duplicate files removed. Version 2 draws from Software Heritage and covers 600+ programming languages, making it a strong base for training and retrieval in code-aware RAG systems.