FontBook is the best app for designer! Typography is the most necessary part of the design thus we are always in the process of searching the proper font. FontBook helps you in it! You can find fonts by name, style category, typographical subclassification, designer name, foundry name, year of publication, or by similarity of design. What I most like about the app is that it inspires to make really good things in design and typography. We should work even harder to achive excellent results like Jürgen Siebert with his FontBook.
524Mb in size. 110 typefoundries. 620 000 typerface speciments.
PS I would add some historic insight about authors, it’s just suggestion