Libraries for CAPTCHA/human verification that are free and can be self hosted? (Not a service)

This page summarizes the projects mentioned and recommended in the original post on /r/PHPhelp
Recaptcha spam abuse

InfluxDB - Power Real-Time Data Analytics at Scale
Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
www.influxdata.com
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  • recaptcha

    PHP client library for reCAPTCHA, a free service to protect your website from spam and abuse.

    • I know Google has a ReCAPTCHA service, and I think it’s free up to scales I would probably never use up. Still, I’d prefer something than can be self hosted so is totally free. And where you don't have to register your domain with a 3rd party, you can just use it on any domain.

  • InfluxDB

    Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

    InfluxDB logo
NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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