The best replacement for pf is ipfw.

The best alternatives to pf are rated as following:

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Speaking about pf, one probably shouldn't forget about dummynet.

Other search terms related to pf and their ratings are:

★★★★★	dummynet
★★★★★	altq

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Scale is based on the average worldwide traffic of pf in all years. Click on graph for more.

ipfw

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