Java

SirixDBsirixdb/sirix

An embeddable, bitemporal, append-only database system and event store that stores immutable snapshots with full history.

Non-Blocking SirixDB HTTP(S)-Serversirixdb/sirix

SirixDB is an embeddable, bitemporal, append-only database system and event store that stores immutable snapshots with full history.

NextGen Connect Integration Enginenextgenhealthcare/connect

An open-source healthcare integration engine for filtering, transforming, extracting, and routing messages between disparate systems.

FlexyPoolvladmihalcea/flexy-pool

FlexyPool adds metrics and dynamic resizing capabilities to Java connection pools, optimizing database performance.

Nodewavesplatform/Waves

Reference implementation of the Waves blockchain node in Scala, enabling decentralized application development.

ScalaTestscalatest/scalatest

A free, open-source testing toolkit for Scala and Java programmers with expressive and flexible testing styles.

DDDplus frameworkfunkygao/cp-ddd-framework

A lightweight DDD enhancement framework for forward and reverse business modeling to support complex system architecture evolution.

react-native-bottom-sheet-behaviorcesardeazevedo/react-native-bottom-sheet-behavior

A React Native wrapper for Android's BottomSheetBehavior with support for anchor states, custom app bars, and FloatingActionButton.

Capsulepuniverse/capsule

A packaging and deployment tool that bundles JVM applications into single executable JARs with embedded dependencies and launch metadata.

Instancioinstancio/instancio

A Java library that automatically creates and populates objects with reproducible random data for unit testing.

Toothpickstephanenicolas/toothpick

A scope tree based, reflection-free Dependency Injection library for Java, Kotlin, and Android.

Dataflow Frameworktypetools/checker-framework

A pluggable type-checking framework for Java that detects and prevents bugs through custom type qualifiers.

rtreedavidmoten/rtree

Immutable in-memory R-tree and R*-tree implementations in Java with a reactive API for spatial indexing.

Pact JVMDiUS/pact-jvm

JVM implementation of Pact for consumer-driven contract testing, providing mock services and verification tools.

jtecasid/jte

A secure and lightweight template engine for Java and Kotlin with intuitive syntax and blazing fast performance.

Damn Insecure Vulnerable Application (DIVA)payatu/diva-android

An intentionally insecure Android app designed to teach secure coding and penetration testing through hands-on vulnerability challenges.

Hazelcast Jethazelcast/hazelcast-jet

An open-source, in-memory, distributed batch and stream processing engine for Java applications.

OpenJPEGuclouvain/openjpeg

An open-source JPEG 2000 codec written in C, officially recognized as a JPEG 2000 Reference Software.

graphql-spqrleangen/GraphQL-SPQR

A Java library for rapid development of GraphQL APIs using a code-first approach.

hivemq-mqtt-clienthivemq/hivemq-mqtt-client

A high-performance, feature-rich Java client library for MQTT 5.0 and 3.1.1 with multiple API flavors and backpressure support.

SystemMLapache/systemml

An open-source machine learning system for the end-to-end data science lifecycle from data preparation to model serving.

Riiablocollinsmith/riiablo

A cross-platform Diablo II remake built with Java and LibGDX, supporting PC, Android, and multiplayer.

Datumboxdatumbox/datumbox-framework

An open-source Java framework for rapid development of machine learning and statistical applications with large dataset support.

OpenAPI Diff (k)OpenAPITools/openapi-diff

A utility for comparing two OpenAPI 3.x specifications and rendering differences in HTML, Markdown, Asciidoc, JSON, or plain text.

DSL-JSONngs-doo/dsl-json

A high-performance JVM JSON library with advanced compile-time databinding for Java, Android, Scala, and Kotlin.

DSL-JSONngs-doo/dsl-json

A high-performance JVM JSON library with compile-time databinding for Java, Android, Scala, and Kotlin.

JSONassertskyscreamer/JSONassert

A Java library for writing concise JSON unit tests, especially useful for testing REST APIs.

SortableTableViewISchwarz23/SortableTableView

An Android library providing customizable TableView and SortableTableView components for displaying and sorting tabular data.

TeXtidotesylvainhalle/textidote

A grammar and style checker for LaTeX and Markdown documents that preserves source file location mapping.

Pokemon GO Java APIGrover-c13/PokeGOAPI-Java

A Java API for interacting with Pokémon GO servers, enabling programmatic gameplay and data access.

hppccarrotsearch/hppc

High-performance Java collections for primitive types with open internals and custom API design.

Parallel Framework Java-Clientsaikrishna321/AppiumTestDistribution

A tool for running Appium tests in parallel across Android and iOS real devices and simulators.

StringTemplateantlr/stringtemplate4

A Java template engine for generating source code, web pages, emails, and other formatted text output with strict model-view separation.

MobiDevelop's RoboVM ForkMobiVM/robovm

An ahead-of-time compiler for Java bytecode that targets iOS, macOS, and Linux platforms.

KolobokeOpenHFT/Koloboke

A Java Collections Framework extension with high-performance primitive specializations and drop-in replacements for JDK collections.

Apache Artemis (k)apache/artemis

A high-performance, multi-protocol message broker supporting AMQP, MQTT, and STOMP for diverse messaging use cases.