https://notebooklm.google.com/

BEST of BOTH Worlds? Digitizing Field Notes inside Obsidian [Showcase] by [[CyanVoxel]]

While mostly a digital guy, Tom Standage uses Moleskine's reporter's notebooks which he likes because they're the size of an iPhone 6 plus.

iPhone 6+ (6.22 in x3.06 in)<br /> Moleskine reporter's notebook (3.5 x 5.5 inches)

1478-1518, Notebook of Leonardo da Vinci (''The Codex Arundel''). A collection of papers written in Italian by Leonardo da Vinci (b. 1452, d. 1519), in his characteristic left-handed mirror-writing (reading from right to left), including diagrams, drawings and brief texts, covering a broad range of topics in science and art, as well as personal notes. The core of the notebook is a collection of materials that Leonardo describes as ''a collection without order, drawn from many papers, which I have copied here, hoping to arrange them later each in its place according to the subjects of which they treat'' (f. 1r), a collection he began in the house of Piero di Braccio Martelli in Florence, in 1508. To this notebook has subsequently been added a number of other loose papers containing writing and diagrams produced by Leonardo throughout his career. Decoration: Numerous diagrams.

https://www.val.town/

Val Town is a collaborative notebook for APIs

https://en.wikipedia.org/wiki/Notebook_interface

https://quarto.org/

A list of disadvantages of digital gardens versus paper-based notebooks.