Free and Open Source, Distributed, RESTful Search Engine

Free universal database tool and SQL client

Mirror of Apache Kafka

Apache Flink

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

Apache Hadoop

Logstash - transport and process your logs, events, or other data

Graphs for Everyone

Apache Druid: a high performance real-time analytics database.

Apache Doris is an easy-to-use, high performance and unified analytics database.

Apache ZooKeeper

Apache Cassandra®

Apache Tomcat

Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.

Apache IoTDB

Apache Groovy: A powerful multi-faceted programming language for the JVM platform

Apache Ignite

Apache Avro is a data serialization system.

Java MQTT lightweight broker

Fast scalable time series database

Useful Resources for Low Level System Design

Apache Accumulo

this is raft java project. raft-kv-storage

Implementation of GoF design patterns using Java 21

The Lark programming language.

Algorithms for implementation of Clock Synchronization, Consistency, Mutual Exclusion, Leader Election

A simple cassandra like kv store using gossip protocol

Kronotop is a Redis-compatible, distributed document database backed by FoundationDB.

message queue and broker system similar to Kafka or RabbitMQ.

Coral: Federated Query Join Order Optimization Based on Deep Reinforcement Learning