Cochenille Design Studio 
Knitting design software company. Good product descriptions, some demos. Offers programs on several platforms.
http://www.cochenille.com/Rose's Knits
Information and technical support for machine and hand knitting software. Programs include Mr. Card, Dr. Cutter, Knitpic, Thumb Print. Free programs, patterns and updates are found here too.
http://www.roses-knits.com/
Village Yarns
Specializes in hand dyed, painted, natural fiber, fashion and precious fiber yarns.
http://www.villageyarns.com/
Knitting Software Inc.
Software for the hand knitter written by a hand knitter, including sweater and sock charting, color and texture, calculation and custom grid paper.
http://www.software4knitting.com/
AranPaint
Software for creating textured, knitting stitch patterns. Free demo and stitch patterns available for download.
http://members.iinet.net.au/~coolhoun/
