Wikisource is an online digital library of free content textual sources on a wiki, operated by the Wikimedia Foundation. Its aims are to host all forms of free text, in many languages, and translations. The project holds works that are either in the public domain or freely licenced; professionally published works or historical source documents; and are verifiable.
Verification was initially made offline, or by trusting the reliability of other digital libraries. Now works are supported by online scans via the ProofreadPage extension, which ensures the reliability and accuracy of the project's texts. Some Wikisources now only allow works backed up with scans.
While the bulk of its collection are texts, Wikisource hosts other media, from comics to film to audio books. Wikisource allows user-generated annotations in some languages (subject to the specific policies).