In 2010 I started a 10 year experiment: Roman Notes, an "hardware" open-source guidebook to Rome.
The idea of the book is that you can take it to Rome and take some notes and sketches inside the book. Who returns the book to me by 2020 becomes part of a shared exhibition. There are 64 places documented with a map, a sketch and two empty pages. The places are the outcome of an one year study in 2006, when i followed an Itinerario from 1835 by Giovanni Battista Cipriani. During that year I was studying and drawing more than 350 buildings in Rome.
You can get Roman Notes here: https://edcat.net/item/roman-notes/
The onlinemap you see above is in BETA stage and will be completed during the next weeks.