It’s rather shocking that you can go to these websites, and search for IDMS and find nothing.
Back in the day’, these were the major software vendors – but the companies have had to move on to stay alive and succeed.

Computer Associates –
http://www3.ca.com/solutions/ProductFamily.aspx?ID=126

Allen Systems Groups –
http://www.asg.com/products/products.asp (Search for IDMS).

TACT – http://www.tact.com/software/docs/products_ezdb.html (EZ-DB Tools)

Arch Consulting – http://www.archcons.com Provides remote database admin support and occassional training classes. They also sell a tool that draws schema (Bachman) diagrams directly from the dictionary.