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MeiliSearch
A lightning-fast search API that fits effortlessly into your apps, websites, and workflow
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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.
Meilisearch - https://www.meilisearch.com - 10,000 free searches/month, then $0.25/1,000 searches.
Sphinx - https://sphinxsearch.com
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.