Feast Afrique Digital Library, curated by Nigerian food writer and culinary anthropologist Ozoz Sokoh (the Kitchen Butterfly) and includes cookery pertaining to food of Africa and the African diaspora.
Little Cookbooks collection at the Michigan State University Library includes a selection of promotional cookbooks and more, most from the United States
Recipe for Victory: Food and Cooking in Wartime from the University of Wisconsin-Madison includes cookbooks, government publications, and more, all digitized. (Some may be easier to read if downloaded.)
Service Through Sponge Cake (joint project of Indiana University & Indianapolis Public Library) includes Indiana-centered historical cookbooks
The Wikimedia Cookbook is a large (and growing!) collection of world recipes, housed on Wikimedia Commons. The link is to the English language version; other languages are available as well. Select from the language options on the left-hand sidebar, including German, Spanish, French, and Tagalog.
Recipes & Food Preparations
A Guide to Brewing Uji-cha Tea from Kyoto Prefecture on Google Arts and Culture includes step-by-step photos of the Uji-cha process.
Màmá Àshàké's Hot Àmàlà recipe from the Centenary Project on Google Arts and Culture includes step-by-step photos of Màmá Àshàké's process.