1.RoaringBitmap / RoaringBitmap
A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others
+18 stars
from 3,937 · score 2.94
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2.apache / solr
Apache Solr open-source search software
+14 stars
from 1,679 · score 2.71
3.codelibs / fess
Open-source, self-hosted enterprise & site search server built on OpenSearch. Crawls web / file / DB / cloud sources, 20+ languages, REST API, and AI/RAG & semantic search. Apache-2.0.
+5 stars
from 1,137 · score 1.79
4.strapdata / elassandra
Elassandra = Elasticsearch + Apache Cassandra
+3 stars
from 1,715 · score 1.39