D&D 5E Biggest & best 3PP products for 5e?

[Morlock]

What are your "bonanza" third party products for 5e?

E.g.,

Fifth Edition Foes
Book of Lost Spells
The (not really) Complete Encyclopedia Magica
The (not really) Complete Tome of Spells

 

[AaronOfBarbaria]

I'm thinking that the first 3PP for 5th edition that will get more than a neutral response from me is the not-even-finished-yet Scarred Lands Player's Guide

 

[Morlock]

Yeah I'm looking forward to that one.