Here’s some useful links to websites whose focus spans from medieval logic to theories of matter, from Euclid to Richard Rufus and beyond.
History of Pre-Modern Mathematics
Jens Høyrup’s webpage (primary sources and secondary literature on the history of mathematics)
Sources in the History of Algebra (by Albrecht Heeffer)
Projects
The Aristoteles Latinus Project (director: Lisa Devriese)
The Richard Rufus of Cornwall Project (general editor: Rega Wood)
Calculatores Project by Irene Binini
i² – The Impossible and the Imaginable by Graziana Ciola (ERC project on late-medieval semantics of impossibility and the roots of complex mathematics)
Specific Topics
Matters of Matter by Zita Toth
Potestas Essendi by Nicola Polloni
Logicalia Medievalia by Caterina Tarlazzi
Texts and Transmission
Euclid’s Elements in the Middle Ages by Menso Folkerts
Medieval Philosophy Digital Resources by Jean-Luc Solère
Post-Reformation Digital Library by David S. Sytsma et al.
What’s New in the Medieval Philosophy Community
In medias PHIL by Robert Pasnau
Medieval Philosophy and Beyond
History of Philosophy Without Any Gaps by Peter Adamson