The best replacement for form 7 is jetpack.

The best alternatives to form 7 are rated as following:
★★★★★  jetpack
★★★★  form 35
★★  cforms
★  form 6

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Speaking about form 7, one probably shouldn't forget about captcha.

Other search terms related to form 7 and their ratings are:
★★★★★ captcha
★★★ qtranslate
★★★ mailchimp
★★★ recaptcha
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form 7
jetpack
form 35