https://crowd.loc.gov/ In July, I started volunteering with the Library of Congress (LOC) "By The People" project. There's no specific commitment. You can create an account and it will track your work in terms of number of articles (but not hours spent.) Basically the LOC needs people to help transcribe documents to allow them to be searched and used by researchers. You can help as a transcriber where you write the transcriptions or as a reviewer where you review completed ones and edit them for accuracy. I've done both. I feel more fulfilled when I do some kind of volunteering, and this scratches the itch for now.
How well-scanned are the documents? I saw some badly scanned Ancient Greek documents on Twitter a while back... it'd be easier to read a two-year-old child's coloring page than that thing. 100% contrast, no color, so half the letters weren't even there at all.
Some are perfectly legible, especially those from the 1940s and later. Some are badly scanned or the originals are hard to read. You can zoom in and adjust brightness/contrast as needed. Some aren't in English, and some are in that 1800s script handwriting that I can't decipher at all. My favorite things to transcribe so far were summaries of the laws of different countries prepared in the 1960s. They were very legible (having been typed) and interesting to read. My least favorite was a document in Hungarian because I hadn't a clue what it said. I reproduced it faithfully, though.
