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Free and Open Source, Distributed, RESTful Search Engine

😮 Core Interview Questions & Answers For Experienced Java(Backend) Developers | 互联网 Java 工程师进阶知识完全扫盲：涵盖高并发、分布式、高可用、微服务、海量数据处理等领域知识

doocs / leetcode

🔥LeetCode solutions in any programming language | 多种编程语言实现 LeetCode、《剑指 Offer（第 2 版）》、《程序员面试金典（第 6 版）》题解

floci-io / floci

Light, fluffy, and always free - The AWS Local Emulator alternative

apache / skywalking

APM, Application Performance Monitoring System

doocs / source-code-hunter

😱 从源码层面，剖析挖掘互联网行业主流技术的底层实现原理，为广大开发者 “提升技术深度” 提供便利。目前开放 Spring 全家桶，Mybatis、Netty、Dubbo 框架，及 Redis、Tomcat 中间件等

thingsboard / thingsboard

All-in-one IoT Platform - Device management, data collection, processing and visualization.

YunaiV / yudao-cloud

ruoyi-vue-pro 全新 Cloud 版本，优化重构所有功能。基于 Spring Cloud Alibaba + MyBatis Plus + Vue & Element 实现的后台管理系统 + 用户小程序，支持 RBAC 动态权限、多租户、数据权限、工作流、三方登录、支付、短信、商城、CRM、ERP、MES、IM、AI 大模型、IoT 物联网等功能。你的 ⭐️ Star ⭐️，是作者生发的动力！

APIJSON / APIJSON

🏆 Real-Time no-code, powerful and secure ORM 🚀 providing APIs and Docs without coding by Backend, and Frontend(Client) can customize response JSONs 🏆 实时零代码、全功能、强安全 ORM 库 🚀 后端接口和文档零代码，前端(客户端) 定制返回 JSON 的数据和结构

questdb / questdb

QuestDB is a high performance, open-source, time-series database

apache / doris

Apache Doris is a real-time analytics and hybrid search database for AI agents.

apache / druid

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

opensearch-project / OpenSearch

🔎 Open source distributed and RESTful search engine.

trinodb / trino

Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)

PaperMC / Paper

The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies

StarRocks / starrocks

The world's fastest open query engine for sub-second analytics both on and off the data lakehouse. With the flexibility to support nearly any scenario, StarRocks provides best-in-class performance for multi-dimensional analytics, real-time analytics, and ad-hoc queries. A Linux Foundation project.

jhy / jsoup

jsoup: the Java HTML parser, built for HTML editing, cleaning, scraping, and XSS safety.

resilience4j / resilience4j

Resilience4j is a fault tolerance library designed for Java8 and functional programming

awsdocs / aws-doc-sdk-examples

Welcome to the AWS Code Examples Repository. This repo contains code examples used in the AWS documentation, AWS SDK Developer Guides, and more. For more information, see the Readme.md file below.

traccar / traccar

Open source GPS tracking platform - self-hosted or managed, 200+ device protocols

dropwizard / metrics

:chart_with_upwards_trend: Capturing JVM- and application-level metrics. So you know what's going on.

apache / hertzbeat

An AI-powered next-generation open source real-time observability system.

cymcsg / UltimateRecyclerView

A RecyclerView(advanced and flexible version of ListView in Android) with refreshing,loading more,animation and many other features.

NLPchina / elasticsearch-sql

Use SQL to query Elasticsearch

gephi / gephi

Gephi - The Open Graph Viz Platform

apache / zeppelin

Web-based notebook that enables data-driven, interactive data analytics and collaborative documents with SQL, Scala and more.

haifengl / smile

Statistical Machine Intelligence & Learning Engine

apache / fesod

Fast. Easy. Done. Processing spreadsheets without worrying about large files causing OOM.

obsidiandynamics / kafdrop

Kafka Web UI

btraceio / btrace

Production-safe dynamic tracing and diagnostics for Java applications—attach to live JVMs with no restart or recompilation.

JanusGraph / janusgraph

JanusGraph: an open-source, distributed graph database

diffplug / spotless

Keep your code spotless

oshi / oshi

Native Operating System and Hardware Information

brianfrankcooper / YCSB

Yahoo! Cloud Serving Benchmark

micrometer-metrics / micrometer

An application observability facade for the most popular observability tools. Think SLF4J, but for observability.

grimmory-tools / grimmory

A self-hosted library for your ebooks, comics, and audiobooks

geoserver / geoserver

Official GeoServer repository

crate / crate

CrateDB is a distributed and scalable SQL database for storing and analyzing massive amounts of data in near real-time, even with complex queries. It is PostgreSQL-compatible, and based on Lucene.

tchiotludo / akhq

Kafka GUI for Apache Kafka to manage topics, topics data, consumers group, schema registry, connect and more...

Netflix / maestro

Maestro: Netflix’s Workflow Orchestrator

apache / paimon

Apache Paimon is a lake format that enables building a Realtime Lakehouse Architecture with Flink and Spark for both streaming and batch operations.

prometheus / jmx_exporter

A process for collecting metrics using JMX MBeans for Prometheus consumption

apache / avro

Apache Avro is a data serialization system.

openrocket / openrocket

Model-rocketry aerodynamics and trajectory simulation software

komoot / photon

an open source geocoder for openstreetmap data

alldatacenter / alldata

🔥🔥 AllData可定义数据中台，以数据平台为底座，以数据中台为桥梁，以机器学习平台为工厂，以大模型应用为上游产品，提供全链路数字化解决方案。产品正式演示体验、社群咨询、商务采购：https://docs.qq.com/doc/DVHlkSEtvVXVCdEFo

sepinf-inc / IPED

IPED Digital Forensic Tool. It is an open source software that can be used to process and analyze digital evidence, often seized at crime scenes by law enforcement or in a corporate investigation by private examiners.

javamelody / javamelody

JavaMelody : monitoring of JavaEE applications

spring-projects / spring-data-elasticsearch

Provide support to increase developer productivity in Java when using Elasticsearch. Uses familiar Spring concepts such as a template classes for core API usage and lightweight repository style data access.

risesoft-y9 / Digital-Infrastructure

数字底座是一款面向大型政府、企业数字化转型，基于身份认证、组织架构、岗位职务、应用系统、资源角色、数据目录、安全控制等功能构建的统一且安全的管理支撑平台。数字底座基于三员管理模式，具备微服务、多租户、容器化和国产化，支持用户利用代码生成器快速构建自己的业务应用，同时可关联诸多成熟且好用的内部生态应用。

Azure / azure-sdk-for-java

This repository is for active development of the Azure SDK for Java. For consumers of the SDK we recommend visiting our public developer docs at https://docs.microsoft.com/java/azure/ or our versioned developer docs at https://azure.github.io/azure-sdk-for-java.