Repository Index

Free and Open Source, Distributed, RESTful Search Engine

• elasticsearch
• java
• search-engine

Learn System Design concepts and prepare for interviews using free resources.

• awesome
• backend
• computer-science
• distributed-systems

Open Source Identity and Access Management For Modern Applications and Services

• keycloak
• oidc
• saml

Telegram for Android source

• telegram

PDF Parser for AI-ready data. Automate PDF accessibility. Open-source.

• json
• markdown
• pdf
• ai

Orchestrate everything, everywhere. The open-source control plane for workflows across data, infrastructure, business processes and AI agents. Declarative YAML, event-driven, any language, Git-versioned, scalable to millions of executions.

• orchestration
• data-orchestration
• high-availability
• infrastructure-as-code

Learn Low Level Design (LLD) and prepare for interviews using free resources.

• awesome
• design-patterns
• interview
• interview-practice

:fire: Seata is an easy-to-use, high-performance, open source distributed transaction solution.

• tcc
• saga
• xa
• at

🔥 人人可用的开源 BI 工具，数据可视化神器。An open-source BI tool alternative to Tableau.

• tableau
• data-visualization
• superset
• apache-doris

😱 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

• sourcecode-analysis
• spring
• mybatis
• netty

GraalVM compiles applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀

• java
• aot
• compiler
• graalvm

Awesome LeetCode resources to learn Data Structures and Algorithms and prepare for Coding Interviews.

• algorithms
• coding
• data-structures
• leetcode

Tinker is a hot-fix solution library for Android, it supports dex, library and resources update without reinstall apk.

• android
• dynamic
• hotfix
• wechat

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

• time-series
• low-latency
• database
• sql

The ZAP by Checkmarx Core project

• zap
• zap-development
• dast
• appsec

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

• authentication
• session-management
• login
• supertokens

💪 A framework for assisting in the renovation of Android componentization (帮助 Android App 进行组件化改造的路由框架)

• android
• router
• navigation
• componentization

🔎 Open source distributed and RESTful search engine.

• search
• search-engine
• analytics
• java

Spring源码阅读

• spring
• notes
• source-code-analysis

A free, secure and open source app for Android to manage your 2-step verification tokens.

• otp
• totp
• hotp
• android

LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot.

• huggingface
• java
• langchain
• openai

Open-Source Web UI for Apache Kafka Management

• kafka-ui
• kafka-brokers
• kafka
• kafka-streams

OpenRefine is a free, open source power tool for working with messy data and improving it

• datacleansing
• data-analysis
• java
• opendata

开源的端到端产品级通用智能体