Liam Redmond writes to GNW readers:

"I have a website with free online chord and scale generators for multiple instruments, tunings, chords and scales..."
http://www.guitar-resource.co.uk

"Also I have PC software for the same but with many more features and demo download is available"

Software page:
http://www.guitar-resource.co.uk/pages/software.html

Direct download (1.5Mb)

"I usually make the point that this is not the cheapest software but I provide full support and a free major upgrade in the price"

see also:

http://www.guitarsite.com/chords.htm
http://www.guitarsite.com/software.htm
http://www.guitarsite.com/tab.htm
http://www.SharewareMusicMachine.com/