There's 48 designs, so this isn't much of a database, more like a short list. For something completely different, my favorite collection of paper planes are those by Jayson Merrill: https://www.youtube.com/@jayson5674 They're the most complex planes I've seen under the restrictions of no cuts and no adhesive. Here's a good one: https://www.youtube.com/watch?v=K-n6NAbJduk