Luthiery
If you know me or work for a company I've dealt with please contact me for a link. I've racked my brain trying to add as many links as possible but I'm sure I've missed a few.

Wood
California Walnut Design
Gilmer Wood Company
Wood Workers Source

Tools & Supplies
Stewart-MacDonald
Luthiers Mercantile International
All Parts
Allied Luthierie
Grizzly Industrial

Parts
Nordstrand Pickups
RMC Pickups
Roland USA
Hipshot Products
Sperzel Tuners

Discussion & Resources
Bass-Builders.com
Association of Stringed Instrument Artisans
Guild of American Luthiers
Frank Ford's FRETS.com
Talk Bass Forum
Acoustic Guitar Magazine Forums
The Gear Page Forum
Project Guitar

Miscellaneous
Lawrence McFadden Wood Finishing Products
Fiber Optic Products
Roberto-Venn School Of Luthiery