The best replacement for quartus is modelsim.

The best alternatives to quartus are rated as following:
★★★★★  modelsim
★★★★  vivado
★★★  ise
★  xilinx

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Speaking about quartus, one probably shouldn't forget about modelsim.

Other search terms related to quartus and their ratings are:
★★★★★ modelsim
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quartus
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