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marvin-framework
Marvin Image Processing Framework provides features for processing images and videos in real-time.
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resemble-java
Java fork of Resemble.js javascript library for Image Comparison (https://github.com/Huddle/Resemble.js)
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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.
The Marvin Image Processing Framework provides a good FOSS solution.
If you are looking for the Free tool, you can use the https://github.com/toninofox/resemble-java. You guys can try out the Paid Percy (by BrowserStack) works very well.
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.