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

Apache Kafka - A distributed event streaming platform

Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access control, also trigger webhooks on database events.

Conductor is an event driven agentic orchestration platform providing durable and highly resilient execution engine for applications and AI Agents

Scalable datastore for metrics, events, and real-time analytics

Give your JS App some Backbone with Models, Views, Collections, and Events

Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

Dapr is a portable runtime for building distributed applications across cloud and edge, combining event-driven architecture with workflow orchestration.

Event bus for Android and Java that simplifies communication between Activities, Fragments, Threads, Services, etc. Less code, better quality.

Low-code programming for event-driven applications

Apache RocketMQ is a cloud native messaging and streaming platform, making it simple to build event-driven applications.

Production-grade Rust-native trading engine with deterministic event-driven architecture

Full-sized drag & drop event calendar in JavaScript

Examples of how to do query, style, dom, ajax, event etc like jQuery with plain javascript.

🚀 Coroutine-based concurrency library for PHP

The most intuitive desktop API client. Organize and execute REST, GraphQL, WebSockets, Server Sent Events, and gRPC 🦬

Event-driven network library for multi-threaded Linux server in C++11

Logstash - transport and process your logs, events, or other data

A curated list of Domain-Driven Design (DDD), Command Query Responsibility Segregation (CQRS), Event Sourcing, and Event Storming resources

Event notification library

🥊 Tiny 200 byte functional event emitter / pubsub.

Ultra fast asyncio event loop.

An asynchronous event driven PHP socket framework. Supports HTTP, Websocket, SSL and other custom protocols.

🚀 gnet is a high-performance, lightweight, non-blocking, event-driven networking framework written in pure Go.

KEDA is a Kubernetes-based Event Driven Autoscaling component. It provides event driven scale for any container running in Kubernetes

Building event-driven applications the easy way in Go.

Android library to observe scroll events on scrollable views.

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. It has a robust event-based programming language which provides protection from a range of attacks against web applications and allows for HTTP traffic monitoring, logging and real-time analysis.

Event-driven, non-blocking I/O with PHP.