elastic / elasticsearch

Free and Open Source, Distributed, RESTful Search Engine

doocs / advanced-java

😮 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

TheAlgorithms / Java

All Algorithms implemented in Java

zxing / zxing

ZXing ("Zebra Crossing") barcode scanning library for Java, Android

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

apache / doris

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

opensearch-project / OpenSearch

🔎 Open source distributed and RESTful search engine.

vespa-engine / vespa

The AI search platform

NLPchina / elasticsearch-sql

Use SQL to query Elasticsearch

haifengl / smile

Statistical Machine Intelligence & Learning Engine

JSQLParser / JSqlParser

JSqlParser parses an SQL statement and translate it into a hierarchy of Java classes. The generated hierarchy can be navigated using the Visitor Pattern

JanusGraph / janusgraph

JanusGraph: an open-source, distributed graph database

oracle / opengrok

OpenGrok is a fast and usable source code search and cross reference engine, written in Java

JabRef / jabref

Desktop app for managing BibTeX and BibLaTeX (.bib) libraries

s4kibs4mi / java-developer-roadmap

Roadmap to becoming a Java developer in 2026

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.

JFormDesigner / FlatLaf

FlatLaf - Swing Look and Feel (with Darcula/IntelliJ themes support)

yacy / yacy_search_server

Distributed Peer-to-Peer Web Search Engine and Intranet Search Appliance

TNG / ArchUnit

A Java architecture test library, to specify and assert architecture rules in plain Java

openrewrite / rewrite

Automated mass refactoring of source code.

apache / lucene

Apache Lucene open-source search software

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.

internetarchive / heritrix3

Heritrix is the Internet Archive's open-source, extensible, web-scale, archival-quality web crawler project.

power721 / alist-tvbox

AList proxy server for TvBox, support playlist and search.

komoot / photon

an open source geocoder for openstreetmap data

researchxxl / syncthing-android

Syncthing-Fork - A Syncthing Wrapper for Android.

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.

starcwang / easy_javadoc

IntelliJ IDEA 插件，自动生成javadoc文档注释

bonigarcia / webdrivermanager

Automated driver management and other helper features for Selenium WebDriver in Java

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。

itext / itext-java

iText for Java represents the next level of SDKs for developers that want to take advantage of the benefits PDF can bring. Equipped with a better document engine, high and low-level programming capabilities and the ability to create, edit and enhance PDF documents, iText can be a boon to nearly every workflow.

MarginaliaSearch / MarginaliaSearch

Internet search engine for text-oriented websites. Indexing the small, old and weird web.

continew-org / continew-admin

🔥Almost最佳后端规范🔥页面现代美观，且专注设计与代码细节的高质量多租户中后台管理系统框架。开箱即用，持续迭代优化，持续提供舒适的开发体验。当前采用技术栈：SpringBoot v3.4.x (Java17)、Vue3 & ArcoDesign、TS、Vite5 、SaToken、MyBatisPlus、Redisson、FastExcel、CosId、JetCache、JustAuth、Crane4j、SpringDoc、Hutool 等。

sanluan / PublicCMS

More than 2.7 million lines of code modification continuously iterated for 10 years to modernize java cms, easily supporting tens of millions of data, tens of millions of PV; Support static, server side includes; Currently has 0.0005% of the world's users (w3techs provided data), language support in Chinese, Japanese, English

IzzelAliz / Arclight

A Bukkit(1.20/1.21) server implementation in modding environment using Mixin. ⚡

langgraph4j / langgraph4j

🚀 LangGraph for Java is a library for Graph Engineering, designed to build sophisticated AI agentic architectures within the Java ecosystem. It works seamlessly with both Langchain4j and Spring AI.

elastic / elasticsearch-hadoop

:elephant: Elasticsearch real-time search and analytics natively integrated with Hadoop

javahongxi / whatsmars

Java生态研究(Spring Boot + Redis + Dubbo + RocketMQ + Elasticsearch)🔥🔥🔥🔥🔥

TimefoldAI / timefold-solver

The open source Solver AI for Java and Kotlin to optimize scheduling and routing. Solve the vehicle routing problem, employee rostering, task assignment, maintenance scheduling and other planning problems.

datastax / jvector

JVector: the most advanced embedded vector search engine

spring-guides / tut-spring-security-and-angular-js

Spring Security and Angular:: A tutorial on how to use Spring Security with a single page application with various backend architectures, ranging from a simple single server to an API gateway with OAuth2 authentication.

mateaix / matecloud

🔥MateCloud是一款基于Spring Cloud Alibaba的微服务架构。目前已经整合Spring Boot 4.0.8、 SpringCloud 2025、Spring Cloud Alibaba 2025、Spring AI 2.0.1、Spring Security Oauth2、Feign、Dubbo、JetCache、RocketMQ等，支持多租户的低代码平台，Saas平台开发套件

aklivity / zilla

🦎 A lightweight, multi-protocol gateway for event-driven applications and AI agents. Expose and govern Kafka, MQTT, APIs, and MCP through one high-performance engine with shared routing, security, schema, and observability.

dingodb / dingo

A multi-modal vector database that supports upserts and vector queries using unified SQL (MySQL-Compatible) on structured and unstructured data, while meeting the requirements of high concurrency and ultra-low latency.

apache / solr

Apache Solr open-source search software

Arcticons-Team / Arcticons

A monotone line-based icon pack for android

ebean-orm / ebean

Ebean ORM

GoogleCloudPlatform / bank-of-anthos

Retail banking sample application showcasing Kubernetes and Google Cloud

qupath / qupath

QuPath - Open-source bioimage analysis for research

dadoonet / fscrawler

Elasticsearch File System Crawler (FS Crawler)

troyzhxu / bean-searcher

🔥🔥🔥 A read-only ORM for complex queries in Java

hantsy / spring-reactive-sample

Spring Reactive playground

infinispan / infinispan

Infinispan is an open source data grid platform and highly scalable NoSQL cloud data store.

bbottema / simple-java-mail

Simple API, Complex Emails (Jakarta Mail smtp wrapper)

archimatetool / archi

Archi: ArchiMate Modelling Tool

FaceAISDK / FaceAISDK_Android

Android on_device Face Recognition 、 Liveness detection and 1:N & M:N Face Search SDK 端侧可离线人脸识别 活体检测 以及1:N M:N 人脸搜索SDK

sakaiproject / sakai

Sakai is a freely available, feature-rich technology solution for learning, teaching, research and collaboration. Sakai is an open source software suite developed by a diverse and global adopter community.

SonarSource / sonar-java

:coffee: SonarSource Static Analyzer for Java Code Quality and Security

ArcadeData / arcadedb

ArcadeDB Multi-Model Database, one DBMS that supports SQL, Cypher, Gremlin, HTTP/JSON, MongoDB and Redis. ArcadeDB is a conceptual fork of OrientDB, the first Multi-Model DBMS. ArcadeDB supports Vector Embeddings.