jvm — open-source software health

Maven · PyPI

96Exceptionalhealth index

Koog is a JVM (Java and Kotlin) framework for building predictable, fault-tolerant and enterprise-ready AI agents across all platforms – from backend services to Android and iOS, JVM, and even in-browser environments. Koog is based on our AI products expertise and provides proven solutions for complex LLM and AI problems

Kotlin★ 4,553Sep 1, 2026

Apache-2.0Sep 1, 2026 · metrics 2.10.0

Maven · npm

96Exceptionalhealth index

reactor/reactor-core

Non-Blocking Reactive Foundation for the JVM

Java★ 5,235Aug 28, 2026

Apache-2.0Aug 28, 2026 · metrics 2.10.0

Maven

94Exceptionalhealth index

GradleUp/shadow

Gradle plugin for creating fat/uber JARs, transforming files, relocating packages, and optimizing applications with R8/ProGuard. The Gradle counterpart to Maven Shade Plugin.

Kotlin★ 4,224Aug 21, 2026

Apache-2.0Aug 21, 2026 · metrics 2.10.0

Maven · npm

94Exceptionalhealth index

apache/logging-log4j2

Apache Log4j is a versatile, feature-rich, efficient logging API and backend for Java.

Java★ 3,610Jul 15, 2026

Apache-2.0Jul 15, 2026 · metrics 2.10.0

Maven · RubyGems

93Exceptionalhealth index

jruby/jruby

JRuby, an implementation of Ruby on the JVM

Ruby · Java★ 3,915Aug 28, 2026

Custom licenseAug 28, 2026 · metrics 2.10.0

Maven

91Excellenthealth index

eclipse-vertx/vert.x

Vert.x is a tool-kit for building reactive applications on the JVM

Java★ 14.7KAug 27, 2026

Custom licenseAug 27, 2026 · metrics 2.10.0

Maven · PyPI

91Excellenthealth index

testcontainers/testcontainers-java

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.

Java★ 8,723Aug 28, 2026

MITAug 28, 2026 · metrics 2.10.0

Maven

90Excellenthealth index

mongodb/mongo-java-driver

The official MongoDB drivers for Java, Kotlin, and Scala

Java · Groovy★ 2,658Jul 21, 2026

Apache-2.0Jul 21, 2026 · metrics 2.10.0

Maven

90Excellenthealth index

open-telemetry/opentelemetry-kotlin

An implementation of the OpenTelemetry specification as a Kotlin Multiplatform Library

Kotlin★ 134Jul 15, 2026

Apache-2.0Jul 15, 2026 · metrics 2.10.0

Maven

90Excellenthealth index

testng-team/testng

TestNG testing framework

Java★ 2,054Jul 30, 2026

Apache-2.0Jul 30, 2026 · metrics 2.10.0

PyPI

89Excellenthealth index

softwaremill/ox

Safe direct-style streaming, concurrency and resiliency for Scala on the JVM

Scala★ 521Aug 23, 2026

Apache-2.0Aug 23, 2026 · metrics 2.10.0

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88Excellenthealth index

flix/flix

The Flix Programming Language

Flix · Scala★ 2,728Aug 15, 2026

Custom licenseAug 15, 2026 · metrics 2.10.0

crates.io

88Excellenthealth index

jni-rs/jni-rs

Rust bindings to the Java Native Interface — JNI

Rust★ 1,580↓ 20.8M/moAug 8, 2026

Apache-2.0Aug 8, 2026 · metrics 2.10.0

Maven

87Excellenthealth index

couchbase/couchbase-jvm-clients

Java, Scala, and Kotlin SDKs for server-side development with Couchbase.

Java · Scala★ 56Aug 26, 2026

Apache-2.0Aug 26, 2026 · metrics 2.10.0

Maven · npm

86Excellenthealth index

alibaba/arthas

Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas

Java★ 37.5KAug 5, 2026

Apache-2.0Aug 5, 2026 · metrics 2.10.0

NuGet

83Excellenthealth index

ikvmnet/ikvm

A Java Virtual Machine and Bytecode-to-IL Converter for .NET

C# · Java★ 1,562Aug 23, 2026

Custom licenseAug 23, 2026 · metrics 2.10.0

Maven

81Excellenthealth index

autonomousapps/dependency-analysis-gradle-plugin

Gradle plugin for JVM projects written in Java, Kotlin, Groovy, or Scala; and Android projects written in Java or Kotlin. Provides advice for managing dependencies and other applied plugins

Kotlin · Groovy★ 2,171Jul 27, 2026

Apache-2.0Jul 27, 2026 · metrics 2.10.0

crates.io

81Excellenthealth index

hextriclosan/rusty-jvm

A comprehensive, from-scratch Java Virtual Machine built in Rust, featuring a modular architecture, full bytecode support, and JNI integration

Rust · Java★ 80↓ 3,929/moAug 9, 2026

MITAug 9, 2026 · metrics 2.10.0

crates.io

80Excellenthealth index

theseus-rs/ristretto

Java Virtual Machine

Rust · Java★ 57↓ 888/moJul 24, 2026

Apache-2.0Jul 24, 2026 · metrics 2.10.0

Go · Maven

78Goodhealth index

steadybit/extension-jvm

A Steadybit extension for jvm applications based actions (discovery / attacks)

Java · Go★ 0Jul 17, 2026

MITJul 17, 2026 · metrics 2.10.0

Maven

77Goodhealth index

restatedev/sdk-java

Restate SDK for JVM Languages

Java · Kotlin★ 57Jul 15, 2026

MITJul 15, 2026 · metrics 2.10.0

Maven

75Goodhealth index

oshai/kotlin-logging

Lightweight Multiplatform logging framework for Kotlin. A convenient and performant logging facade.

Kotlin★ 3,106Aug 21, 2026

Apache-2.0Aug 21, 2026 · metrics 2.10.0

Maven

75Goodhealth index

pdvrieze/xmlutil

XML Serialization library for Kotlin

Kotlin★ 499Jul 21, 2026

Apache-2.0Jul 21, 2026 · metrics 2.10.0

Maven

67Goodhealth index

NucleusFramework/Nucleus

Nucleus is the native desktop platform for the JVM. Combined with Compose Multiplatform, it forms the most complete, most performant, and most deeply integrated desktop application stack ever built — on any language, any runtime, any platform.

Kotlin · C★ 308Jul 24, 2026

MITJul 24, 2026 · metrics 2.10.0

Maven · npm

67Goodhealth index

integrallis/vectors

The Ultimate Vectors Library for Java

Java★ 16Aug 28, 2026

Apache-2.0Aug 28, 2026 · metrics 2.10.0

npm · NuGet · crates.io +2

63Moderatehealth index

nostrdevkit/nostr-sdk-ffi

Nostr SDK - Native language bindings

Rust★ 17↓ 304/moAug 1, 2026

MITAug 1, 2026 · metrics 2.10.0

Maven

62Moderatehealth index

alexmond/gotmpl4j

A complete Go text/template + Sprig engine for the JVM — byte-for-byte parity across 1,305 of Go's own test cases. Spring Boot starter, no Go toolchain.

Java★ 1Jul 25, 2026

Apache-2.0Jul 25, 2026 · metrics 2.10.0

Maven · npm

60Moderatehealth index

integrallis/models

In-JVM small language model inference

Java★ 3Sep 4, 2026

Apache-2.0Sep 4, 2026 · metrics 2.10.0

Maven

57Moderatehealth index

flowerjvm/flower

Flower JVM: Lightweight Java workflow runtime for explicit, testable orchestration inside one JVM.

Java★ 0Jul 24, 2026

Apache-2.0Jul 24, 2026 · metrics 2.10.0

Maven

56Moderatehealth index

kormium/kormium

A type-safe, reflection-free Kotlin Multiplatform ORM / SQL DSL for server and client. One schema and query model for PostgreSQL, MySQL and SQLite; runs on JVM, Native, R2DBC, Node, Android, iOS and the browser (Wasm), with transactions and compile-time catalog safety.

Kotlin★ 18Jul 24, 2026

Apache-2.0Jul 24, 2026 · metrics 2.10.0

#jvm