Even though this is not about GIF viewers:
TeraTerm for Windows95 (and Win31):
Description:
A customizable telnet client with VT100 (some
VT200/300) and TEK4010 emulations, X/ZModem, B-Plus,
Quick-VAN and Kermit transfer protocols, works on TCP/IP
connections, as wellas serial dial-ups. Scripting is possible with
"Tera Term Language".
The emulator is freeware and provides a decent tek emulator for
viewing GCG graphics output.
R:)