Taurus PT945. Has the "triple action" safety, up for cocked and locked, down past "OFF" for de-cock. Beretta improved it on the 9000S (but 9mm & .40S&W, no .45ACP) making it up past "ON" for de-cock which eliminates the potential problem with the Taurus system if you are in the habit of keeping your thumb on the safety lever while shooting.
Astra had a sorta SIG clone in .45ACP with a decocker.
Do you want to count the Para Ordnance "LDA" system as a decocker?
In addition to the 4526, S&W did offer a factory slide mounted decocker option for the 4506. In the newer guns, it was a simple parts change. Older ones needed some gunsmithing.
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