Mainframe computers are large monolithic systems, which usually require custom or specially written software applications. The companies in this category primarily engineer these applications.
Develops graphical Java connectivity products that web-enable Mainframe and AS/400 systems and automatically present their screens as GUIs. http://www.resqnet.com/
UK company performing bespoke software development for IBM mainframes, AS400, and UNIX systems. Also integrates legacy systems with emerging technologies. http://www.alia.co.uk/
Application performance improvement specialists that reduce run-time and CPU-time of application programs in an IBM mainframe environment. http://msinow.com/