Sjöström Audio

http://audioamp.eu
This is a webshop focused on DIY tube amps and accessories. The webshop is located in Czech Republic.
http://www.awdiy.com/
miniVreg, precision voltage regulator and other DIY stuff such as clock oscillators. A webshop is connected.
http://www.bergrans.com/site/cd-pro2mlf-cd-player/power-supply/
Martin van den Berg has modified his CD with a JSR03 super regulator. He has made a very good looking installation. The JSR03 is fully replaced by SSR01 from Sjöström Audio.
http://www.vistaprint.com
A nice service if you want nice looking but cheap business cards, of course nothing is for free but it's cheap.
http://www.cirrus.com
Manufacturer of extremely high class ADC's and DAC's. Crystal (Cirrus Logic) ar world leader but AKM is breathing in their neck...
http://www.dahlbergaudiodesign.se/del1/del1.htm
Bengt Dahlberg has made an excellent description of how to build a "band"-tweeter. The article is in swedish but you may understand quite much since there are lot's of pictures. You can also send him a email.
http://www.freepcb.com
FreePCB is a free, open-source PCB editor for Microsoft Windows, released under the GNU General Public License. It was designed to be easy to learn and easy to use, yet capable of professional-quality work. It does not have a built-in autorouter, but...
http://groundsound.com
Very nice looking surface mounted power amp modules. You can also find a digital crossover filter. He sells kits.
http://www.hificollective.co.uk
DIY stuff such as Tent shunt regulators, loudspeaker elements, tube amps. products from NewClassD such as regulators, discrete opamps, soft start.
http://www.meier-audio.homepage.t-online.de
This Dr. Jan Meier has a couple of interesting and nice looking designs, a headphone amp with crossfeed and a power amp built with 44 pc. of opamps! Cool!
http://www.phi-audio.com
High-End hi-fi company based in South Africa with a focus on fine workmanship and a bent for the minimalist.