From the top of my head, the only other series with major GT3 fields around that time period were International GT Open, Pirelli World Challenge, IMSA/Grand Am, ADAC GT and British GT, though the latter were usually rather light on Ferraris. I keep forgetting when the GT3 iteration of French GT collapsed, but they had quite a few Ferraris running in their last years as well.
Edit: Forgot about the Asian series, so there are probably a few more in GT Asia, Thailand Supercar and perhaps in Super GT or one of the Chinese national series, though my information on that is really somewhat limited.
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