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RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.
Netty project - an event-driven asynchronous network application framework
Open Source Identity and Access Management For Modern Applications and Services
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
GraalVM compiles applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀
A high performance caching library for Java
QuestDB is a high performance, open-source, time-series database
🏗 Build container images for your Java applications.
Zuul is a gateway service that provides dynamic routing, monitoring, resiliency, security, and more.
Apache Druid: a high performance real-time analytics database.
Very spicy additions to the Java programming language.
Conductor is a microservices orchestration engine.
Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process …
Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.
1️⃣🐝🏎️ The One Billion Row Challenge -- A fun exploration of how quickly 1B rows from a text file can be aggregated with Java
📈 Capturing JVM- and application-level metrics. So you know what's going on.
JanusGraph: an open-source, distributed graph database
Thumbnailator - a thumbnail generation library for Java
Open-Source Subscription Billing & Payments Platform
Reactive Streams Specification for the JVM
The official AWS SDK for Java 1.x (In Maintenance Mode, End-of-Life on 12/31/2025). The AWS SDK for Java 2.x is available here: https://github.com/aws/aws-sdk-java-v2/