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SQL basics
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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RabbitMQ
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Graph: Neo4j
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materialize
The Cloud Operational Data Store: use SQL to transform, deliver, and act on fast-changing data. (by MaterializeInc)
Materialize - The Streaming Database for Real-time Analytics
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Apache Hive
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Wide column: Apache Cassandra, Apache HBase
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Apache Hadoop and HDFS
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Apache Beam
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Apache Arrow
Apache Arrow is the universal columnar format and multi-language toolbox for fast data interchange and in-memory analytics
Apache Arrow
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Apache Airflow
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.