Open source for data and AI

Projects749Relicensed101

749 projects · 101 relicensed

Apache Solr license, foundation and stars

Query and processing engines · Apache 2.0 (open source) · 1,699 stars

GitHub

Apache Solr open-source search software

License history

LICENSE file

Apache 2.0 No license change recorded since the repository was created in 2021.

Latest release

No GitHub releases published; the project releases elsewhere (tags or its own site).

More in query and processing engines

Custom or mixed (see the LICENSE file)62k starspathwayPython ETL framework for stream processing, real-time analytics, LLM pipelines, and RAG.-36 a weekBSD 3-Clause50.3k starspandasFlexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more.+85 a weekApache 2.044.4k starsApache SparkApache Spark - A unified analytics engine for large-scale data processing.Apache · +65 a weekMIT43k starsDuckDBDuckDB is a high-performance analytical database system.DuckDB Foundation · +180 a week · v1.5.5, Jul 22, 2026MIT40.3k starsPolarsExtremely fast Query Engine for DataFrames, written in Rust.Polars · +67 a week · py-1.44.2, Sep 9, 2026Apache 2.017.3k starsApache ArrowApache Arrow is the universal columnar format and multi-language toolbox for fast data interchange and in-memory analytics.Apache · +20 a week · apache-arrow-25.0.1, Aug 10, 2026Apache 2.016.8k starsprestoThe official home of the Presto distributed SQL query engine for big data.+5 a weekApache 2.015.7k starsApache HadoopA query and processing engine by apache, written in Java.+6 a week
ProjectStars
pathwayPython ETL framework for stream processing, real-time analytics, LLM pipelines, and RAG.Custom or mixed (see the LICENSE file)62k
pandasFlexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more.BSD 3-Clause50.3k
Apache SparkApache Spark - A unified analytics engine for large-scale data processing.ApacheApache 2.044.4k
DuckDBDuckDB is a high-performance analytical database system.DuckDB FoundationMIT43k
PolarsExtremely fast Query Engine for DataFrames, written in Rust.PolarsMIT40.3k
Apache ArrowApache Arrow is the universal columnar format and multi-language toolbox for fast data interchange and in-memory analytics.ApacheApache 2.017.3k
prestoThe official home of the Presto distributed SQL query engine for big data.Apache 2.016.8k
Apache HadoopA query and processing engine by apache, written in Java.Apache 2.015.7k
About and history
Repository
apache/solr · created Feb 23, 2021
Website
solr.apache.org
Language
Java
Foundation
None; run by its maintainers
GitHub detects
Apache-2.0
Stars per week
4 (GitHub weekly snapshots)

Weekly snapshots

Week ofStars
Nov 2, 20261,699
Oct 26, 20261,691
Oct 12, 20261,687
Oct 5, 20261,683
Sep 21, 20261,677

Changes

Stars per weekNov 7, 2026

Gains about 4 stars a week, up from 3.

Stars per weekOct 9, 2026

Gains about 3 stars a week.

TrackedSep 25, 2026

Now tracked, from apache/solr on GitHub.