The best replacement for sqlmap is sqlninja.

The best alternatives to sqlmap are rated as following:
★★★★★  sqlninja
★★★  havij

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Speaking about sqlmap, one probably shouldn't forget about metasploit.

Other search terms related to sqlmap and their ratings are:
★★★★★ metasploit
★ proxychains
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sqlmap
sqlninja
havij