The modern Grand Touring class of racing is currently by far my favorite form of Motorsport. It’s true when it came to selecting what race events I wanted to volunteer in the past and it’s true now when it comes to what diecast models I choose to add to my collection.
What are GT race cars, and specifically the very best of them – the GT3 cars?
Here’s the list below, borrowing heavily from the FIA GT3 Wikipedia page (and Motorsport.com) with real photo examples:
The list includes GTE cars which are Factory Motorsport efforts that are either heavily modified GT3 cars or GT3-prototypes later released for Customer Motorsport efforts as GT3 cars. These are the top-Pro GT teams that compete in WEC and IMSA.
Acura / Honda

FIA Homologation # GT3-047 / Racing since 2017-
Photo credit: Motorsport.com
Ascari

FIA Homologation # GT3-006 / Racing since 2005-
Photo credit: Motorsport.com
Aston Martin

Racing since 2018-
Photo credit: Motorsport.com

FIA Homologation # GT3-032 / Racing since 2013-
Photo credit: Motorsport.com

FIA Homologation # GT3-003 / Racing since 2006-
Photo credit: Motorsport.com
Audi

FIA Homologation # GT3-038 / Racing since 2013-
Photo credit: Motorsport.com

FIA Homologation # GT3-017 / Racing since 2009-
Photo credit: Motorsport.com
Bentley

FIA Homologation # GT3-049 / Racing since 2018-
Photo credit: Motorsport.com

FIA Homologation # GT3-035 / Racing since 2013-
Photo credit: Motorsport.com
BMW

Racing since 2018-
Photo credit: Motorsport.com

FIA Homologation # GT3-043 / Racing since 2016-
Photo credit: Motorsport.com

Racing since 2012-
Photo credit: Motorsport.com

FIA Homologation # GT3-023 / Racing since 2010-
Photo credit: Motorsport.com

FIA Homologation # GT3-018 / Racing since 2009-
Photo credit: Motorsport.com
Cadillac

FIA Homologation # GT3-039 / Racing since 2015-
Photo credit: Motorsport.com
Camaro

FIA Homologation # GT3-033 / Racing since 2013-
Photo credit: Motorsport.com
Corvette

Racing since 2014-
Photo credit: Motorsport.com

FIA Homologation # GT3-045 / Racing since 2016-
Photo credit: Motorsport.com

FIA Homologation # GT3-026 / Racing since 2008-
Photo credit: Motorsport.com

FIA Homologation # GT3-005 / Racing since 2005-
Photo credit: Motorsport.com
Ferrari

Racing since 2016-
Photo credit: Motorsport.com

FIA Homologation # GT3-044 / Racing since 2016-
Photo credit: Motorsport.com

Racing since 2011-
Photo credit: Motorsport.com

FIA Homologation # GT3-029 / Racing since 2011-
Photo credit: Motorsport.com

FIA Homologation # GT3-009 / Racing since 2006-
Photo credit: Motorsport.com
Ford

Racing since 2016-
Photo credit: Motorsport.com

FIA Homologation # GT3-011 and GT3-016 / Racing since 2007-
Photo credit: Motorsport.com

FIA Homologation # GT3-010 / Racing since 2007-
Photo credit: Motorsport.com
Jaguar

RACB Homologation # G3-105 / Racing since 2012-
Photo credit: Motorsport.com

FIA Homologation # GT3-021 / Racing since 2009-
Photo credit: Motorsport.com

FIA Homologation # GT3-012 / Racing since 2007-
Photo credit: Motorsport.com
Lamborghini

FIA Homologation # GT3-040 / Racing since 2015-
Photo credit: Motorsport.com

FIA Homologation # GT3-024 / Racing since 2011-
Photo credit: Motorsport.com

FIA Homologation # GT3-004 / Racing since 2007-
Photo credit: Motorsport.com
Lexus

FIA Homologation # GT3-046 / Racing since 2017-
Photo credit: Motorsport.com
Maserati

FIA Homologation # GT3-034 / Racing since 2009-
Photo credit: Motorsport.com
Mercedes-Benz

FIA Homologation # GT3-042 / Racing since 2016-
Photo credit: Motorsport.com

FIA Homologation # GT3-028 / Racing since 2011-
Photo credit: Motorsport.com
McLaren

FIA Homologation pending / Racing since 2019-
Photo credit: Motorsport.com

FIA Homologation # GT3-037 / Racing since 2015-
Photo credit: Motorsport.com

FIA Homologation # GT3-031 / Racing since 2012-
Photo credit: Motorsport.com
Nissan

FIA Homologation # GT3-048 / Racing since 2019-
Photo credit: Motorsport.com

FIA Homologation # GT3-030 / Racing since 2012-
Photo credit: Motorsport.com
Renault

FFSA Homologation / Racing since 2016-
Photo credit: Motorsport.com
Porsche

Racing since 2017-
Photo credit: Motorsport.com

FIA Homologation #GT3-041 / Racing since 2016-
Photo credit: Motorsport.com
Viper

FIA Homologation #GT3-036 / Racing since 2013-
Photo credit: Motorsport.com

Racing since 2012-
Photo credit: Motorsport.com
This page is a work in progress… updated frequently!
PS. If you notice a mistake, please let me know.