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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.
Depends on how consistent and legible the images are. If you've got, say, a scanned page with black-on-white text, it will work fairly well with PHPOCR (http://phpocr.sourceforge.net/) or https://github.com/thiagoalessio/tesseract-ocr-for-php.
NOTE:
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Hence, a higher number means a more popular project.