The best replacement for quickfix is testclear.

The best alternatives to quickfix are rated as following:
★★★★★  testclear
★★★★  fix8
★★★  location list
★★  cameronfix

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Speaking about quickfix, one probably shouldn't forget about stunnel.

Other search terms related to quickfix and their ratings are:
★★★★★ stunnel
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Google Trends

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quickfix
testclear
fix8