Netty

Spring Boot

spring-projects/spring-boot

Popular

Opinionated, auto-configured Spring apps; the dominant Java backend stack, now on Spring Framework 7.

Quarkus

quarkusio/quarkus

Kubernetes-native Java stack from Red Hat with fast startup, low memory and GraalVM native images.

Micronaut

micronaut-projects/micronaut-core

Compile-time DI and AOP framework for low-overhead microservices and serverless functions.

Ktor

ktorio/ktor

JetBrains' coroutine-based Kotlin framework for asynchronous servers and HTTP clients.

Vert.x

eclipse-vertx/vert.x

Reactive, event-driven toolkit on Netty for high-concurrency JVM services.

Jakarta EE

jakarta.ee

Vendor-neutral enterprise Java specs (formerly Java EE) implemented by WildFly, Payara and Open Liberty.

Helidon

helidon-io/helidon

Oracle's lightweight microservices framework built around Java virtual threads.

Javalin

javalin/javalin

Simple, lightweight web framework for Java and Kotlin focused on REST APIs.

Dropwizard

dropwizard/dropwizard

Legacy

Bundles Jetty, Jersey and Jackson into ops-friendly REST services; largely displaced by Spring Boot.