In case you were always looking for the entire body of Kant's work and could not find it, here it is — a digital version of Kant's collected works in German, the Akademie-Ausgabe. That includes his reflections, letters, sidenotes in the books he read etc.
This is a digitalised version of the work printed
by Verlag Walter de Gruyter & Co., Berlin 1969.
PS. Unfortunately, students' notes from his lectures are unavailable in the edition. These are Bd. 24-29. Not all of them have been published.
https://www.korpora.org/kant/
#Kant