USB Information

• CATC
  CATC makes a highly-regarded USB protocol analyzer.
• Cypress
  Cypress makes the EZ-USB™ chips.
• Hitex
  Hitex makes a USB protocol analyzer called USB Agent.
• USB Central
  USB Central provides USB information and code examples for developers from Jan Axelson's books.
• USB Stuff
  USB Stuff carries practically every USB product.