The DMMapp (Digitized Medieval Manuscripts App) is a website that links to more than 300 libraries in the world. Each one of these contains medieval manuscripts that can be browsed for free. The DMMapp is a product of Sexy Codicology, an independent project focused on medieval illuminated manuscripts and social media. It maintains a great blog about medieval manuscripts, especially those that are available online.
In honor of National Library Week, Oxford University Press is making all of its non-journal products available online for free for the week of April 13th-19th, 2014. This includes the Oxford English Dictionary and the Oxford Handbook series. [more inside]