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Elasticsearch is open source, again
(www.elastic.co)
This is a most excellent place for technology news and articles.
Elasticsearch provides a different feature set than Redis or Postgres. I've seen apps that use all 3... but anyway.
It is a little weird to charge per-seat for a search database that is usually integrated into a product, and not used directly by employees. Usually that kind of pricing model is reserved for developer tools like Splunk (notoriously overpriced), or game engines like Unity/Unreal Engine.