I personally created my own via nested macros and rollable tables. Took the better part of a couple months but i 100% suggest it, especially since it teaches you a lot about the system itself within roll20 and allows you to do more in your games.... That being said, if roll20 wants to buy my work id be willing to refine it, it includes clickable macro buttons every rollable table from every chapter, including NPC building, random name generators, etc.