519,064 articles
Apache Livy
Apache Livy is an open-source REST service for submitting Spark jobs and managing long-running Spark contexts, originally built by Cloudera, Microsoft, and Hortonworks; an Apache top-level project since May 2026, default port 8998, latest release 0.9.0-incubating.
Apache Lucene
Apache Lucene is a free, open-source search engine library written in Java, created by Doug Cutting in 2000 and now the core of Apache Solr and Elasticsearch.
Apache Maven
Apache Maven is a build automation and project management tool for Java projects, first released in 2004, built around a Project Object Model XML file.
Apache NiFi
Apache NiFi (originally NSA's Niagarafiles) is an Apache open source dataflow system based on flow-based programming, with a web UI, back pressure, site-to-site transfer, and fine-grained data provenance; Top-Level Project since 2015.
Apache Oozie
Apache Oozie: Yahoo!-created workflow scheduler for Hadoop jobs; DAG workflows in hPDL, coordinator and bundle scheduling; Apache Incubator 2011, TLP 2012, retired to the Attic in 2025.
Apache OpenOffice
Apache OpenOffice is a free and open-source productivity suite developed by the Apache Software Foundation. It is a separate project from LibreOffice, which is a fork of OpenOffice.org and is a more actively developed suite.
Apache ORC
Apache ORC (Optimized Row Columnar) is a self-describing, type-aware columnar file format for Hadoop, created in Hive in January 2013, with striped files, three-level indexes, and independent Java and C++ libraries; latest release 2.3.1 (July 2026).
Apache Ozone
Apache Ozone is an open-source distributed object and file store (S3-compatible API, Hadoop ofs:// interface) originating from HDFS-7240, an Apache top-level project since 2020, scaling to billions of objects and exabytes with Raft replication and erasure coding.
Apache Paimon
Apache Paimon (formerly Flink Table Store) is an Apache top-level lake table format combining lake formats with LSM trees for streaming updates, merge engines, deletion vectors, and multimodal AI storage on Flink and Spark lakehouses.
Apache Parquet
Apache Parquet is an open source, column-oriented data file format designed for efficient data storage. It stores values by column, applies per-column encoding, and embeds schema for query engines.
Apache Pig
Apache Pig is an open-source Apache platform for large-data analysis, using the procedural Pig Latin language compiled to MapReduce, Tez, or Spark jobs on Hadoop; developed at Yahoo from 2006, now dormant.
Apache Pinot
Apache Pinot is an open-source distributed OLAP datastore, built at LinkedIn (2013) and now an Apache Top-Level Project, for sub-second user-facing analytics. Distinguished from Druid and ClickHouse by segment-based columnar storage with per-column indexing and high-concurrency streaming ingestion.
Apache Point Observatory
Apache Point Observatory is a research astronomical observatory in the Sacramento Mountains of southern New Mexico, operated by the Astrophysical Research Consortium and home of the Sloan Digital Sky Survey.
Apache Polaris
Apache Polaris is an open-source Apache Iceberg REST catalog, initiated by Snowflake in 2024, incubating at the ASF from 2024-08-09 and a Top-Level Project since 2026-02-18, offering RBAC, credential vending, federation, and multi-engine interoperability.
Apache Pulsar
Apache Pulsar: open-source, cloud-native distributed pub-sub messaging and streaming platform, originally built at Yahoo, open-sourced 2016, Apache Top-Level Project 2018; layered broker/BookKeeper architecture, multi-tenancy, one million topics, 5.0 LTS release.
Apache Ranger
Apache Ranger is an Apache top-level open-source framework for centralized, fine-grained authorization and auditing across Hadoop, cloud data services, and AI platforms, with plugins enforcing policies locally in services like HDFS, Hive, Kafka, and Trino.
Apache RocketMQ
Apache RocketMQ is an Alibaba-originated distributed messaging and streaming platform, an Apache Top-Level Project since 2017, built around Producers, NameServers, and Brokers, with ordered and transactional messages.
Apache Samza
Apache Samza: a distributed stream processing framework from LinkedIn (2013), built on Kafka with YARN or standalone deployment, RocksDB local state, changelog fault tolerance; latest release 1.8.0 (2023), now Dormant.
Apache SeaTunnel
Apache SeaTunnel (formerly Waterdrop) is an Apache Top-Level Project distributed data integration tool for batch, CDC, and multi-table sync, with ~200 connectors running on its Zeta engine, Flink, or Spark; 3.0.0 released September 2026.
Apache Sedona
Apache Sedona (formerly GeoSpark) is an Apache Software Foundation framework for large-scale geospatial data processing, adding Spatial SQL, indexes, and joins to Spark, Flink, Snowflake, and the single-node SedonaDB runtime.
Apache SINGA
Apache SINGA is an open-source distributed deep learning platform for training large models across multiple machines and GPUs, which became an Apache Top Level Project in 2019.
Apache Software Foundation
The Apache Software Foundation is a US nonprofit, founded in 1999, that provides legal and infrastructure support for volunteer open-source software projects like Apache HTTP Server.
Apache Solr
Apache Solr is an open source, Java-based search server built on Apache Lucene that indexes JSON, XML, CSV, or binary documents over HTTP and offers full-text, vector, and geospatial search.
Apache Spark
Apache Spark is an open-source distributed analytics engine for large-scale data processing, begun at UC Berkeley's AMPLab in 2009 and known for in-memory cluster computing.
Apache Spark Structured Streaming
Apache Spark Structured Streaming is Spark's stream processing engine on Spark SQL, using a DataFrame/Dataset unbounded-table model. Default micro-batch mode gives 100 ms exactly-once processing; Real-time Mode (Spark 4.1+) reaches single-digit millisecond latencies.
Apache Sqoop
Apache Sqoop (SQL-to-Hadoop) was an open-source command-line tool for bulk transfer between relational databases and Apache Hadoop (HDFS, Hive, HBase). Created in 2009 by Aaron Kimball at Cloudera, it became an ASF top-level project in March 2012 and retired to the Attic in June 2021.
Apache Storm
Apache Storm is a free, open-source distributed real-time computation system for unbounded data streams, created at BackType (2011) by Nathan Marz and an Apache top-level project since 2014. Spouts, bolts, and topologies with at-least-once guarantees; current release 3.1.0, 2.x at end of life.
Apache Subversion
Apache Subversion (SVN) is an open-source, centralized version control system that tracks file history in a central repository. Founded by CollabNet in 2000 as a better CVS, it became an Apache project in 2010.
Apache Superset
Apache Superset is an open-source data exploration and visualization platform created at Airbnb in 2015, letting users build charts and interactive dashboards on SQL databases.
Apache Tez
Apache Tez is a DAG-based data-processing execution framework on Hadoop YARN serving as the low-level engine for Hive and Pig; incubated 2013, graduated July 2014, latest release 0.10.5 (2025).