The best replacement for htpasswd is htdigest.

The best alternatives to htpasswd are rated as following:
★★★★★  htdigest
★★★  htpasswd2
★★  htaccess

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Speaking about htpasswd, one probably shouldn't forget about htaccess.

Other search terms related to htpasswd and their ratings are:
★★★★★ htaccess
★ .htaccess
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htpasswd
htdigest
htpasswd2