Piano Is Fun
Learn to read musical notes and play the piano. Junior level.
http://www.pianoisfun.com

Piano ChordZ
[Win] Utility for visually referencing basic, standard, and expanded piano and keyboard chords.
http://www.keynotemusic.com/software.html

Pro Piano Records
Pro Piano offers dozens of piano rental and piano lease plans, with the best service in the business and 800 toll free customer service nationwide
http://propiano.com/

Adventus Incorporated
Adventus, world leader in music education & technology. Learn to play with piano learning software like Piano Suite Premier and Children's Music Journey
http://www.adventus.com/

Mapes Piano String
A family business that manufactures piano strings, spring wire, and specialty wire.
http://www.mapeswire.com/

Lexikon Sonate
Interactive realtime composition running as software on Apple Macintosh computers.
http://www.essl.at/works/Lexikon-Sonate.html

Wilmarc Records, Inc.
Provides piano CDs of solo piano works with or without educational commentary: partial catalog, prices, request form for mail-order catalog.
http://www.wilmarcrecords.com/

Carousel Music
Selection of recordings of authentic old-time automatic music machines including Wurlitzer and European band organs, calliopes, barrel organs, cottage orchestrions, violin piano and piano orchestrions.
http://www.carousels.com/cmusic.htm

Developer Express
Developer Express Inc - Feature-Complete Components, Reporting Tools, IDE Add-ins, and Business Application Frameworks for Visual Studio, Delphi and C++Builder
http://www.devexpress.com/

ScaleTool
Guitar and Piano Scale and Chord Calculator
http://www.scaletool.com/