This app was mentioned in 1 comment, with an average of 1.00 upvote
I've been involved with or co-authored several printed guide books. But, at this point, I think guides like the "gunks app" are the future. I don't know enough about it to create one, though. https://play.google.com/store/apps/details?id=com.gunksapps.gunks&hl=en
Maybe Byron Igoe can point you in the right direction?