Digitised book collections, literary corpora, and audiobook archives, primarily public domain works.
5sources
Word and phrase frequency data drawn from Google's digitised book collection, spanning centuries of published text. It counts how often words and short phrases appear by year, which is useful for historical language analysis and time-aware RAG features.
A volunteer project providing free public domain audiobooks. Volunteers record themselves reading works whose copyright has expired, which makes it a handy source of speech data for training speech-to-text models and building multimodal RAG.
An Internet Archive project building a web page for every book ever published. It holds more than 20 million catalogue records and lends many titles digitally, making it a rich source of book metadata for RAG systems.
A volunteer effort to digitise and archive public domain books, with more than 70,000 free ebooks. Mostly English, but it covers many languages. One of the oldest digital library projects, so it is a clean, permissively licensed source of full-text literature for RAG.
A research-ready version of the Project Gutenberg catalogue with consistent formatting, tidy metadata, and token counts for every book. It saves you the cleanup work, so you get uniform full-text literature ready to chunk and embed for RAG.