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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.
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negative-captcha
A plugin to make the process of creating a negative captcha in Rails much less painful
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
You could put something like Authentik in front of your self hosted apps and enable the captcha stage. If your app also has it's own auth this could be problematic.
LibreCaptcha
SliderCaptcha
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.