Online catalogue with approximately 585,000 descriptions of individual letters and parts of correspondence written in the early-modern and modern period (ca. 1500 - present). Contains information about more than 2 million letters. The letters come from the collections of Dutch heritage institutions, including the KB. For researchers.

The digitized writings of Leuven professor Pieter Willems about his research into 'Low Franconian' dialects. At the end of the 19th century, he collected data on dialect speakers in Flanders, South-Netherlands and the German Rhineland. For the researcher of language and dialects.

Database of approximately 20,000 (transcribed) letters written by and sent to 17th century scholars from the Republic of the Seven United Netherlands. Search results are also visually displayed in terms of geography, time and correspondent networks. Useful for historians and history enthusiasts.

Online catalogue of bibliographic descriptions of publications on manuscripts from the Middle Ages to the present day. Contains information about publications only from the collections of the Koninklijke Bibliotheek (KB) and the Dutch book museum Museum Meermanno. Overview for book scholars, handwriting experts, historians and literary scholars.

Database of thousands of letters and documents that English privateers captured from Dutch ships in the 17th and 18th centuries. Contains a global inventory of more than 700 relevant archive boxes from the British archive in London. Search or filter by keyword, period, place, location, signature, ship name, or person name. Interesting for historians and researchers of Dutch maritime history.