Sefaria, a nimble online database of Jewish texts in both their original language and in translation, is rapidly becoming the red-hot center of the source sheet universe, which I assure you is a thing. Since Sefaria was founded in 2013, over 12,000 people have made some 74,000 source sheets using the site’s handy source sheet builder. Of those, 7,200 of their creations are available online.