PC Mus
- Custom built DAWs (digital audio workstations) and computer upgrades for music recording studios. Also contains many tips on recording audio at home.
- http://www.pcmus.com/

Magix AG
- Makers of Samplitude and Sequoia. Product information, downloads, support. View site in English or German.
- http://www.samplitude.com/

Dawbox
- Offers a selection of complete digital audio workstations, sound cards, and software.
- http://www.dawbox.com/

SEK'D
- Maker of digital audio converters and I/O cards for PCs, including the Samplitude 2496 and ADDA 2496 converters and the Prodif Gold PCI digital I/O card with ADAT interface. Site features software demos for download, and lots of product information.
- http://www.sekd.com/

Digital Audio Labs (DAL)
- Manufacturer of the CardD, CardD Plus, CardDeluxe PC sound cards and the V8 multichannel realtime studio system for Cakewalk.
- http://www.digitalaudio.com/

Frontier Design Group
- Audio interface cards and I/O boxes for PCs, with professional grade specs.
- http://www.frontierdesign.com/