The best replacement for webscarab is burp.

The best alternatives to webscarab are rated as following:
★★★★★  burp
★★★★  zap
★★★  fiddler
★★  burp suite
★★  paros

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Speaking about webscarab, one probably shouldn't forget about webgoat.

Other search terms related to webscarab and their ratings are:
★★★★★ webgoat
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Google Trends

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webscarab
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