From the FIA page ( which somehow states Group B to be a separate part of Group A which if true I didn't know before ).
The Lancia Stratos HF (homologated in FIA Group4, the GroupB predecessor)
The Ford Escort RS1600/RS1800 (homologated in FIA Group4)
The Fiat 131 Abarth (homologated in FIA Group4)
The Audi Sport Quattro (homologated in GroupB)
The Citroën BX 4TC (homologated in GroupB, never raced)
The Ferrari 288 GTO (homologated in GroupB, never raced)
The Lancia 037 a.k.a. rally (homologated in GroupB)
The Lancia Delta S4 (homologated in GroupB)
The Lancia Delta Integrale (all versions including the Delta 4WD with the exception of the Evoluzione II)
The Subaru Impreza Turbo (pre-1997 models)
The Toyota Celica GT4 (all versions)
The Ford Sierra RS500
The Ford RS200 (homologated in GroupB)
The Ford Sierra RS Cosworth
The Ford Sierra RS Cosworth 4x4
The Ford Escort RS Cosworth (the pre-1995 Garrett T03/04B turbo equipped cars)
The MG Metro 6R4 (homologated in GroupB)
The Nissan Sunny (Pulsar) GTiR
The Peugeot 205 Turbo 16 (homologated in GroupB)
The Porsche 959 (homologated in GroupB)
The Mazda 323 turbo 4x4 (all versions)
The Mitsubishi Lancer Evolution (all pre-Evolution VII versions)
The Renault 5 Turbo (homologated in GroupB)
The Volkswagen Golf G60 Rally
Hope that'll do ( some weird ones included like the Ferrari 288 GTO, did hear it was homologated for
a Group B, not realising it might be the rally one ).
You may bow now.