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Koha
Koha is a free software integrated library system (ILS). Koha is distributed under the GNU GPL version 3 or later. ***Note: this is a synced mirror of the official Koha repo. Note: This project uses its own bug tracker, see https://bugs.koha-community.org/ to report a bug or submit a patch.
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Paperless-ng
Discontinued A supercharged version of paperless: scan, index and archive all your physical documents
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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.
paperless-ng might be for you.
Gonna throw drill into the ring. It is explocitly not an indexed searcher. It drills through all filesystems accessible to your machine. If indexed searchers fail you, you will surely find it with drill if you know at least a part of the file's name.