#1
krahets/hello-algo
《Hello 算法》：动画图解、一键运行的数据结构与算法教程。支持简中、繁中、English、日本語，提供 Python, Java, C++, C, C#, JS, Go, Swift, Rust, Ruby, Kotlin, TS, Dart 等代码实现
Stars 124659
Forks 14998Java ecosystem
Best open source Java repositories on GitHub
Browse fast-moving open source repositories across major programming languages and compare which ecosystems are producing the strongest developer momentum right now.
Engineering teams, founders, and developers who want a cleaner view than raw GitHub search.
Why This Matters
Language-specific rankings help teams compare tooling, frameworks, and infrastructure inside the ecosystem they actually use.
What To Look For
Prioritize repositories with recent maintenance, clear adoption signals, and a practical use case that matches your stack.
Best Fit
Engineering teams, founders, and developers who want a cleaner view than raw GitHub search.
How To Evaluate Java Repositories
The goal is not to sort everything by lifetime stars. Good language pages should help you spot current leaders, breakout projects, and repos that are still shipping actively.
Use the repository detail pages to compare why a project is trending now, who it is for, and what alternatives may fit the same problem.
Related Language Guides
Top Java Repositories Right Now
A practical shortlist of Java repositories worth evaluating based on recent GitHub momentum.
#2
elastic/elasticsearch
Free and Open Source, Distributed, RESTful Search Engine
Stars 76446
Forks 25832#3
apache/kafka
Apache Kafka - A distributed event streaming platform
Stars 32288
Forks 15079#4
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
Stars 35848
Forks 9382#5
xuxueli/xxl-job
A distributed task scheduling framework.（分布式任务调度平台XXL-JOB）
Stars 30008
Forks 11454#6
keycloak/keycloak
Open Source Identity and Access Management For Modern Applications and Services
Stars 33714
Forks 8216#7
DrKLO/Telegram
Telegram for Android source
Stars 28845
Forks 9412#8
apache/skywalking
APM, Application Performance Monitoring System
Stars 24765
Forks 6640#9
openjdk/jdk
JDK main-line development https://openjdk.org/projects/jdk
Stars 22721
Forks 6298#10
Anuken/Mindustry
The automation tower defense RTS
Stars 27133
Forks 3386#11
JetBrains/intellij-community
IntelliJ IDEA & IntelliJ Platform
Stars 19909
Forks 5727#12
conductor-oss/conductor
Conductor is an event driven agentic orchestration platform providing durable and highly resilient execution engine for applications and AI Agents
Stars 31602
Forks 845#13
quarkusio/quarkus
Quarkus: Supersonic Subatomic Java.
Stars 15583
Forks 3123#14
questdb/questdb
QuestDB is a high performance, open-source, time-series database
Stars 16829
Forks 1558#15
PaperMC/Paper
The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies
Stars 12120
Forks 3347#16
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.
Stars 11541
Forks 2383#17
checkstyle/checkstyle
Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.
Stars 8911
Forks 4087#18
jhy/jsoup
jsoup: the Java HTML parser, built for HTML editing, cleaning, scraping, and XSS safety.
Stars 11358
Forks 2280#19
apache/beam
Apache Beam is a unified programming model for Batch and Streaming data processing.
Stars 8540
Forks 4524#20
LawnchairLauncher/lawnchair
No clever tagline needed.
Stars 12514
Forks 1479FAQ
How should I use these language rankings?
Use them as a shortlist. Start with the top repositories, open the project detail pages, and compare maintenance pace, momentum, and relevance to your own stack.
Are these pages better than searching GitHub directly?
They are better for discovery because they combine GitHub popularity with recent movement and a cleaner comparison flow.
Does GHTrending only show mature projects?
No. The rankings are designed to surface both established leaders and newer repositories that are gaining momentum quickly.