e-codices -- Virtual Manuscripts in Switzerland Can limit by language, century, collection, and more, with "advanced search."
Digitised Manuscripts (British Library) Use keyword "French" and date slider. There are 187 French manuscripts dated between 1000 and 1350.
Polonsky Foundation England and France Project: Medieval England and France, 700-1200. The national libraries of Great Britain and France have joined efforts in ‘The Polonsky Foundation England and France Project: Manuscripts from the British Library and the Bibliothèque nationale de France, 700-1200’ to digitise 400 illuminated manuscripts from each collection. The project focuses on manuscripts produced on either side of the English Channel over half a millennium of close cultural and political interaction. These manuscripts cover a variety of themes and topics, illustrating the width of intellectual inquiry and pursuit that transmitted inherited texts but also established new traditions. The project, generously funded by The Polonsky Foundation, makes these manuscripts available online free of charge. In November 2018 they may also be viewed together in a joint bilingual viewer to be developed by the Bibliothèque nationale de France, and interpreted in the British Library’s ‘Medieval England and France, 700-1200’ website. British Library Medieval Manuscripts blog.
World Digital Library. Start with "explore" at upper left to select region (France). Fewer relevant manuscripts but there may be some unique items.