Mainframes

Alia Systems Limited
UK company performing bespoke software development for IBM mainframes, AS400, and UNIX systems. Also integrates legacy systems with emerging technologies.
http://www.stateframe.com/

HOB, Inc.
Offers development to facilitate mainframe connectivity and encryption.
http://www.hobsoft.com/

H&W Computer Systems, Inc.
Develops system and application software for mainframes and PCs. Information about products and support.
http://www.hwcs.com/

Innovative Software Solutions
Develops and maintains applications for the AS/400 platform. Also migrates and ports existing software and data.
http://www.webpgmr.com/

IT Doctors
Association of UK-based mainframe consultants. Highlights platforms and languages supported.
http://www.itdoctors.co.uk/

Mainframe Software Innovations
Application performance improvement specialists that reduce run-time and CPU-time of application programs in an IBM mainframe environment.
http://msinow.com/

Maintec Technologies
Offers training and development services.
http://www.maintec.com/

ResQNet
Develops graphical Java connectivity products that web-enable Mainframe and AS/400 systems and automatically present their screens as GUIs.
http://www.resqnet.com/