InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now. Learn more →
Top 23 Java Project Projects
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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Nacos
an easy-to-use dynamic service discovery, configuration and service management platform for building AI cloud native applications.
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Seata
:fire: Seata is an easy-to-use, high-performance, open source distributed transaction solution.
Project mention: Incubator-Seata: Simplify Distributed Transactions with Open Source Efficiency | news.ycombinator.com | 2024-08-06 -
Sentinel
A powerful flow control component enabling reliability, resilience and monitoring for microservices. (面向云原生微服务的高可用流控防护组件)
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FizzBuzz Enterprise Edition
FizzBuzz Enterprise Edition is a no-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes.
Project mention: Only 1 in 10 Oracle Java users want to stay with Big Red | news.ycombinator.com | 2025-01-29https://github.com/EnterpriseQualityCoding/FizzBuzzEnterpris...
I've tried to follow along with it, but man I just can't - it's that crazy.
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Graal
GraalVM compiles Java applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀
Project mention: Project Crema – Open World for Graal Native Image | news.ycombinator.com | 2025-06-10 -
APIJSON
🏆 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 🏆 Real-Time coding-free, powerful and secure ORM 🚀 providing APIs and Docs without coding by Backend, and the returned JSON of API can be customized by Frontend(Client) users
Project mention: Top 15 Open-Source Low-Code Projects with the Most GitHub Stars | dev.to | 2024-07-18GitHub https://github.com/Tencent/APIJSON GitHub Stars 16.9k Most Recent Update on GitHub 2 days ago Open Source License Apache 2.0 Number of Active Contributors This Year 6 Acceptance of External PRs Yes Official Website http://apijson.cn/ Documentation https://apijsondocs.readthedocs.io/en/latest/
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Distributed tracing: This technology follows requests as they bounce between services, showing you exactly where things slow down or break. Tools like Jaeger and Zipkin support OpenTracing standards, and leveraging an OpenTelemetry plugin can make it possible to track requests across different service boundaries without losing the thread.
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Project mention: QuestDB is an open source time-series database for fast ingest and SQL queries | news.ycombinator.com | 2024-08-31
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bytecode-viewer
A Java 8+ Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)
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Project mention: Swift at Apple: Migrating the Password Monitoring Service from Java | news.ycombinator.com | 2025-06-03
Having been in development for a long time, no.
Frankly, it just takes some motivated senior devs and the tantalizing ability to put out the OP blog post and you've got something management will sign off on. Bonus points you get to talk about how amazing it was to use Apple tech to get the job done.
I don't think they seriously approached this because the article only mentioned tuning G1GC. The fact is, they should have been talking about ZGC, AppCDS, and probably Graal if pause times and startup times were really that big a problem for them. Heck, even CRaC should have been mentioned.
It is not hard to get a JVM to startup in sub second time. Here's one framework where that's literally the glossy print on the front page. [1]
[1] https://quarkus.io/
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Language: Java | GitHub: 11.4K+ stars | link
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Traditional databases — PostgreSQL, MySQL, etc. — store their data in proprietary formats. That format is optimized for that engine and can’t be directly accessed by anything else. Even if something like Trino can connect to Postgres, it’s still running queries through Postgres itself, not reading its storage directly. You’re just a client.
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Flowable (V6)
A compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users.
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Project mention: Exploring Firestore with Micronaut and Java 21: A Scalable NoSQL Solution for Modern Applications | dev.to | 2025-06-17
In this article, we'll walk through how to use Firestore on the server side, using Micronaut and Java 21 as our development stack. Let’s dive into how Firestore can help you build scalable, AI-powered applications with ease.
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lettuce
Advanced Java Redis client for thread-safe sync, async, and reactive usage. Supports Cluster, Sentinel, Pipelining, and codecs.
To overcome this limitation, we migrated to Lettuce, an asynchronous Redis client built on top of Netty. With Lettuce, our throughput increased to 60k msg/s, demonstrating the benefits of non-blocking operations and improved parallelism.
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sofa-boot
SOFABoot is a framework that enhances Spring Boot and fully compatible with it, provides readiness check, class isolation, etc.
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Armeria
Your go-to microservice framework for any situation, from the creator of Netty et al. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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 Projects discussion
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Exploring Firestore with Micronaut and Java 21: A Scalable NoSQL Solution for Modern Applications
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Last fifty years of integer linear programming: Recent practical advances
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Project Crema – Open World for Graal Native Image
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Swift at Apple: Migrating the Password Monitoring Service from Java
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Single Sign-On with OpenAM and OpenIG: Practical Implementation Examples
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How To Introduce a New API Quickly Using Micronaut
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A note from our sponsor - InfluxDB
www.influxdata.com | 21 Jun 2025
Index
What are some of the best open-source Project projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Arthas | 36,358 |
| 2 | Nacos | 31,598 |
| 3 | Seata | 25,669 |
| 4 | Sentinel | 22,764 |
| 5 | FizzBuzz Enterprise Edition | 22,549 |
| 6 | Graal | 20,935 |
| 7 | APIJSON | 17,991 |
| 8 | zipkin | 17,222 |
| 9 | mybatis-plus | 16,908 |
| 10 | QuestDB | 15,306 |
| 11 | bytecode-viewer | 15,067 |
| 12 | Quarkus | 14,607 |
| 13 | greenDAO | 12,625 |
| 14 | webmagic | 11,577 |
| 15 | Trino | 11,438 |
| 16 | Flowable (V6) | 8,493 |
| 17 | JavaCV | 7,816 |
| 18 | Leaf | 6,574 |
| 19 | Recaf | 6,459 |
| 20 | Micronaut | 6,235 |
| 21 | lettuce | 5,593 |
| 22 | sofa-boot | 5,041 |
| 23 | Armeria | 4,955 |
Sponsored
InfluxDB – Built for High-Performance Time Series Workloads
InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com