UI-View is an APRS-type application for Windows by G4IDE. It differs from most APRS software in that it isn't created just to be used with TNCs in terminal mode. It also supports TNCs in KISS mode, BPQ host mode, and AGWPE host mode. The host mode support implies that it can be used with a notably wide range of packet hardware and allows up to 16 RF ports to be used.
UI-View has a full-featured internal intelligent digipeater and it has full support for connecting to APRS servers on the internet.
UI-View has an open structure. It is created to make it easy for other software authors to write add-on applications that provide added functionality.
The 16-bit version will work on Win31, Win95, and Win98. It is provided as "registration-ware". You can even use an unregistered copy as it is also relatively fully functional (the only limitation is that some of the IGATE functionality are disabled). Registration costs 10 UK pounds.
UI-View32 is a 32-bit version and thus needs a 32-bit version of Windows - Win95, Win98, Win2000, etc. One cannot use an unregistered version hence it is for registered users only. You will need to register your version of the 32-bit version for a nominal fee to be able to use it.