Top REACTOR GitHub Repositories & Tools (2026)

Discord4J is a fast, powerful, unopinionated, reactive library to enable quick and easy development of Discord bots for Java, Kotlin, and other JVM languages using the official Discord Bot API.

HiveMQ MQTT Client is an MQTT 5.0 and MQTT 3.1.1 compatible and feature-rich high-performance Java client library with different API flavours and backpressure support

Microservices library - scalecube-services is a high throughput, low latency reactive microservices library built to scale. It features: API-Gateways, service-discovery, service-load-balancing, the architecture supports plug-and-play service communication modules and features. built to provide performance and low-latency real-time stream-processing

An open-source nuclear reactor analysis automation framework that helps design teams increase efficiency and quality

Additional optional modules for the Reactor project

Reactor Kotlin Support

An API Gateway built on Spring Framework and Spring Boot providing routing and more.