Mike's excellent advice for focussing D&D prep down to the essentials has made a huge positive impact on my DMing. I highly recommend that anyone running D&D, or any RPG game, who wants to improve their improvisational DMing skills picks this book up and embraces the way of the Lazy Dungeon Master. Especially if you're juggling multiple games and groups! Prep less and play better.

Brilliant to print out for a Storm King's Thunder campaign.

This is a great little adventure that's easy to slot into a nautical-themed campaign.

This is a great supplement with lots of good ideas. I tweaked some of the wording on the spells to fall in line with some of the standard mechanics of 5E spells, just for the sake of simplicity, but the concepts are great and the balance seems good.

D&D is surprisingly lacking in water-based spells, and this really helps flesh it out.

Great maps! I'm intending to use one for my adventuring group in a seafaring setting. The level of detail is great.

This provides an excellent framework for coming up with a race for D&D. A wide variety of features are included, but even going beyond those the techniques described let you get a handle on what ought to be reasonably well balanced within the game. I've enjoyed reading it, and using it for my own homebrew content. Really useful.