In the posts listed below, you will find links to the writing copybooks and penmanship manuals that are available online. You will be able to download most but not all of them, and some may not be complete. Whenever I could, I added a comment on the styles represented in the book as well as some useful information.
I tried to be as exhaustive as I could, but I am sure that some references are missing… As a “pointed pen” person, I probably overlooked books focused on more traditional styles (German books are especially misrepresented here). So please let me know if you’d like me to add or correct anything in these lists.