The University of Iowa Library has an area for crowdsourcing history by helping to transcribe digitized, handwritten Szathmary Culinary Manuscripts and Cookbooks. By helping to transcribe them, or by checking transcriptions made by other users, it helps to make them full-text searchable and therefore more easily accessible to researchers and to the public. Clearly, this is important to some one like me, who is writing a paper on 19th century cooking in the United States. I have created an account and have already taken a look at a few of the cookbooks available to transcribe, based on my chosen time period of study.
Find the site here.