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Top 23 Java Java Projects
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Spring Boot
Spring Boot helps you to create Spring-powered, production-grade applications and services with absolute minimum fuss.
In this tutorial, I'll walk you through how I moved beyond basic logging by instrumenting a Kotlin and Spring Boot backend service with OpenTelemetry. You'll learn how OpenTelemetry's tracing model gives you the execution context that logs alone can't provide. By the end of this guide, you'll have a working instrumented service and a clear mental model for building more observable backend systems.
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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
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Elasticsearch: Distributed, and analytics search engine, scalable data store, vector database focused on speed, production-ready, and scalability support. RAGFlow component, used as its default vector database, while testing, and improving Infinity. Can be used in production environments through Elastic Cloud or configured manually in the cloud platform of choice. A Docker image is available to use it locally.
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Project mention: Are you really wasting your time in Java without these 10 libraries? | dev.to | 2025-11-20
Apache Commons Lang and Google Guava play the same role in the ecosystem, even though the former predates the latter: fill in the gaps in the Java standard APIs. For example, one of the biggest current PITAs in modern Java is checked exceptions inside lambdas. Both libraries provide wrapping methods to handle this specific use case. In general, modern Java versions and Kotlin drastically diminish the need for these additional dependencies.
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Project mention: CLI to manage your SQL database schemas and migrations | news.ycombinator.com | 2025-11-01
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RxJava
RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.
RxJava Documentation
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MPAndroidChart
A powerful 🚀 Android chart view / graph view library, supporting line- bar- pie- radar- bubble- and candlestick charts as well as scaling, panning and animations.
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Project mention: Top 7 Puppeteer Alternatives for Web Automation and Testing (2025) | dev.to | 2025-08-05
Selenium is one of the most popular and mature automated testing frameworks for web applications. Unlike Puppeteer, which is limited to Chromium, Selenium supports all major browsers—including Chrome, Firefox, Safari, and Edge—making it a reliable choice for Cross-platform browser testing.
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Project mention: React Native ile Endüstriyel Barkod Okuma: Ters Renk Data Matrix Kodları ve Zebra DataWedge Entegrasyonu | dev.to | 2025-12-19
ZXing (Zebra Crossing)
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conductor
Conductor is an event driven agentic workflow engine providing durable and highly resilient execution engine for applications and AI Agents
Project mention: Conductor, an orchestration engine for microservices and event-driven workflows | news.ycombinator.com | 2025-10-05 -
Just to throw one on the pile https://github.com/yuliskov/smarttube for android based TV media box is great.
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There are many open-source games. There are few large-scale high-polish open source games because it's difficult to build a business model around that. Unlike non-game software, games are ~exclusively consumer-facing, so you can't sell support or use them as a loss leader, and they're standalone applications that are difficult to monetize with online features or to use as the core of a closed-source commercial product.
That said, there are still lots of great projects out there (some of which have even had commercial success), for example:
- https://github.com/a327ex/SNKRX
- https://github.com/beyond-all-reason/Beyond-All-Reason
- https://github.com/endless-sky/endless-sky
- https://github.com/Anuken/Mindustry
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Project mention: Top Open-Source Data Engineering Tools- Unravelling the Best in 2026 | dev.to | 2025-12-10
Kestra
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Project mention: Performance Test: Flink 1.19 vs. Spark 4.0 vs. Kafka Streams 3.8 Windowed Aggregation Throughput | dev.to | 2026-05-04
Solution & Implementation: Migrated windowed aggregation from Kafka Streams 3.7 to Flink 1.19, reusing existing Kafka sources/sinks. Optimized Flink config: set parallelism to 16 (matching vCPU), enabled RocksDB state backend with 100ms watermark out-of-order tolerance, configured 5s checkpoints. Trained team on Flink watermarking and state management via Apache Flink GitHub repo documentation.
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Project mention: AI Alert Assistant: How n8n + LLM Replace Routine Diagnostics | dev.to | 2026-03-23
Personally, it reminds me of Jenkins about ten years ago — and Jenkins was great. You can install n8n using any of the methods described in the documentation, for example using docker-compose
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Project mention: MonoGame: A .NET framework for making cross-platform games | news.ycombinator.com | 2026-03-07
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Java Java discussion
Java Java related posts
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Nuts – pip/NPM for Java with first-class workspaces and JDK provisioning (9y+)
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OxyJen v0.5: a deterministic graph runtime for AI workflows
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OpenAPI, ORM, SVG and Lottie
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AI, OAuth, And Other Platform APIs In The Core
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On-Device Debugging And JUnit 5
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Every Byte Matters
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Metal Default, A New Build Cloud, And A New Format
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A note from our sponsor - SaaSHub
www.saashub.com | 11 Jun 2026
Index
What are some of the best open-source Java projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Design Patterns | 94,105 |
| 2 | Spring Boot | 80,798 |
| 3 | advanced-java | 78,986 |
| 4 | Elasticsearch | 76,940 |
| 5 | Java | 65,792 |
| 6 | interviews | 64,936 |
| 7 | Guava | 51,480 |
| 8 | dbeaver | 50,419 |
| 9 | jadx | 48,909 |
| 10 | RxJava | 48,239 |
| 11 | Dubbo | 41,516 |
| 12 | MPAndroidChart | 38,201 |
| 13 | Arthas | 37,359 |
| 14 | Selenium WebDriver | 34,156 |
| 15 | spring-boot-demo | 34,106 |
| 16 | ZXing | 33,973 |
| 17 | conductor | 31,915 |
| 18 | SmartTube | 30,414 |
| 19 | Mindustry | 27,849 |
| 20 | kestra | 26,974 |
| 21 | Apache Flink | 26,049 |
| 22 | Jenkins | 25,363 |
| 23 | libGDX | 25,131 |
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