Well, strictly speaking I would consider Campagnolo to be the Snap-On of cycling tools, but they no longer manufacture the range of tools they once did. Their tool range is now limited to tools for frame preparation and tools specific to their line of components. It is no longer in production, but 20 years ago a complete Campy tool kit was considered to be the holy grail by bike mechanics. Bicycles have also changed a great deal and many of the tools in this kit could no longer be used on modern frames of carbon construction. But given the renaissance of steel as a frame material I could see the demand for this type of tool kit returning. So in light of Campy's now limited tool range I consider Park the premier supplier of bike tools.
Here are photos of the Campy kit in all its glory. The pictures don't nearly do it justice. To see it in person is to be humbled.
http://www.classicrendezvous.com/Italy/Campagnolo/CampagToolKit/photo2.jpg
http://www.classicrendezvous.com/Italy/Campagnolo/CampagToolKit/photo9.jpg
http://www.classicrendezvous.com/Italy/Campagnolo/CampagToolKit/index.html
And I just have to mention that Campy does currently make what is undoubtedly the most extravagant, over built, expensive but none the less beautiful chain tool on the planet. And it can only be used specifically on their 11 speed chains. Yours for only $300 retail.
http://www.bikyle.com/images/Parts/Campagnolo_ChainTool11_09.jpg
For a range of specialty tools not made by Park I recommend the Following companies.
The J. A. Stein website is comically simplistic, but the few tools they make are really top notch.
http://www.jastein.com/
Not readily available in the US, but none the less a fantastic line of tools are those made by the Hozan company in Osaka Japan.
http://www.hozan.co.jp/cycle_e/catalog/index.html
Also good is the Var company from France. They are the Park Tool of Europe. Unfortunately their web site is currently available in French only.
http://www.vartools.com/fr/index.php
The best place to source tools from Stein, Hozan and Var is United Bicycle Supply in Ashland Oregon. But they primarily serve the trade and their web presence is almost non existent. Their web page does not even list contact info, but they really are the best source for these tools. The phone number is 541-482-1750.
Of course no list of cycling tools would be compete without mentioning Pedros. They make nice tools to be sure and I have several of their tools in my kit, but I considered them to be a step below Park in quality.
http://www.pedros.com/products_tools.htm