Brain Binders: Paper puzzles free to download.
Brass Puzzles by Rocky: Maker of hand machined brass puzzles.
Hockey Puck Puzzle: Offers a Rubik's cube related 3D puzzle shaped like a hockey puck, with many different design patterns.
Impossible Bottles: Learn the puzzling art of putting large objects into small bottles.
Livewire Puzzles: Makes wire puzzles of various levels of difficulty.
Meffert's World of Puzzles: Manufacturer of many different types of Rubik like puzzles.
Parlor Puzzles: Collectibles, puzzles, and gifts.
Passion for Puzzles: Collector site offers information about puzzles like Rubik, includes pictures, solutions, and strategies.
Potty Puzzles: Puzzle site with wooden assembly, burrs, wire and many other types of mechanical puzzles. (UK)
Puzzle & Craft Factory: Provides Puzzles, Brain teasers, Toys and Games to people of all ages and skill levels
Puzzle People Page: Directory of mechanical puzzle collectors, as well as other information.
Puzzle World: Different varieties of mass produced mechanical puzzles as well as individual hand crafted puzzles and information for collectors.
Puzzles.com: Home site for the Binary Arts line of mind puzzles.
PuzzleSolver: Solutions for the Rubik's Cube and many other mechanical puzzles. Post questions and get answers on the puzzle message board. Has a Puzzle of the Month page.
Russian Puzzles: Connect the cubes to complete the picture on each side. Makes customized puzzles from your pictures.
Tangrams: Ancient Chinese puzzle consisting of 7 geometric shapes. Learn its history, make a set, or try solving one of the shapes.
Tavern Puzzle Collection: Metal puzzles, created by blacksmith Dennis Sucilsky. Puzzle descriptions, and solution pages, complete with diagrams for taking apart puzzles and reassembly. Produced by Tucker-Jones House, Inc.
The Puzzle Museum: Source of information concerning mechanical puzzles and their history.
Thomas Ball: Offers soccer ball shaped mechanical puzzles.
Tumbler Puzzle Solution: Step by step guide to solving the Nintendo Tumbler puzzle.