+[Elasticsearch][elasticsearch], [Metamarkets' Druid][druid], [LinkedIn Pinot][pinot], [Netflix Atlas][atlas], [Apache Spark][spark], [OpenSearchServer][opensearchserver], [Cloud Torrent][cloudtorrent], [Whoosh][whoosh], [InfluxDB](https://www.influxdata.com), [Pilosa][pilosa], [Bleve](http://www.blevesearch.com), [Microsoft Visual Studio Team Services (VSTS)][vsts], and eBay's [Apache Kylin][kylin]. The CRoaring library is used in several systems such as [Apache Doris](http://doris.incubator.apache.org), [ClickHouse](https://github.com/ClickHouse/ClickHouse), [Redpanda](https://github.com/redpanda-data/redpanda), [YDB](https://ydb.tech), [Alibaba Tair](https://www.alibabacloud.com/help/en/redis/developer-reference/tairroaring-command), [clice](https://github.com/clice-io/clice), and [StarRocks](https://github.com/StarRocks/starrocks). The YouTube SQL Engine, [Google Procella](https://research.google/pubs/pub48388/), uses Roaring bitmaps for indexing.
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