UI-View32 is a 32-bit Windows APRS client. The author, Roger Barker G4IDE became a silent key in September 2004, but UI-View32 is still one of the the most popular APRS clients. UI-View32 is no longer maintained due to the source code being destroyed after Roger's death per his wishes. That said, there is still a very active support group and also a development community creating add-on software for UI-View32.There are many "add-ons" and more get created from time to time.
The official UI-View website is now at www.ui-view.org.
UI-View32 can be registered at www.apritch.myby.co.uk/uiv32.htm.
More information can be found here M0CYP UI-View Web Resource .