DIY kits, PCBs, and special parts:
There are a lot of resources for DIY information and bits-n-pieces. Here are some of my favorites:
Music From Outer Space:
Ray Wilson's site. Excellent resource for information as well as PCBs and parts.
Jürgen Haible:
Wow, what do you say about JH? His designs are wonderful, complex, and great fun to build and play with. Modules you won't see anywhere else.
Bridechamber:
Scott Deyo's site. Parts, parts and PCB kits, panels, etc. Scott sells PCBs for several different designers and offers parts kits for many of the PCBs.
Blacet Industries:
John Blacet has a full line of his own designs as kits or pre-built modules. These are well designed, solid modules.
Synthesis Technology or MOTM:
Paul Schreiber's site. Very well designed modules. You can buy PCBs for many of the modules as well as some "small parts kits" which have some hard to find parts in them.
YU Synth
Yves Usson makes some of my favorite modules. See Bridechamber for PCBs.
Tellun - Darmok
Scott Juskiw has some good information and also some circuits. See Bridechamber
Oakley and Krisp1:
PCBs from Oakley and built modules from Paul Darlow at Krisp1. These are excellent designs.
CGS:
Ken Stone's site. PCBs, schematics, and some explanations.
Metalbox:
Great pre-built modules based on CGS designs.
Magic Smoke:
Some parts, PCBs, and information.
Ian Fritz
Another, "wow, what can you say" spot. Ian has some excellent designs (see Bridchamber for PCBs) and some great electronics information.
Wiseguy:
Rest in Peace Larry Hendry... The pages are still there with some good information and resources.
Somatic Circuits
Nice filter based on the SSM2044 chip. Also a TB 303 module
Papareil Synth Labs
Marc Bareille offers some very unique and well thought out modules
Pre-built modules:
While there are some pre-built module sellers above, this list is for those who don't offer any kits, bard PCBs, etc. at least as a general rule. There are a lot out there, but these are ones from whom I've purchased modules and can recommend them.
Analogue Haven
Great online store and Shawn is good to work with.
Doepfer
Encore Electronics
Cyndustries
Synthasonic
TipTopAudio
Gur has some amazing modules. I've got the Z-DSP and Z5000
MFB
Misc. ie: hardware, racks, components, etc.
While there are some pre-built module sellers above, this list is for those who don't offer any kits, bard PCBs, etc. at least as a general rule.
Nice Racks
Dave T makes high quality 19 inch racks. The standard wood is a pine, but he made mine out of mahogony. They are beautiful, see here for a photo or two.
Aaron's General Store
Do you need machine screws, nuts, washers, etc.? This is the place.
Rack Release Systems
Great system for easy install/removal of racks.