Java

Bluetooth LE Library for Androidalt236/Bluetooth-LE-Library---Android

An Android library for easy Bluetooth LE device scanning, advertisement record parsing, and iBeacon support.

DDD LeavenBottegaIT/ddd-leaven-v2

A production-ready DDD and CQRS sample implementation for advanced domain modeling with Spring and JPA.

Esperespertechinc/esper

A Java/.NET component for complex event processing (CEP), streaming SQL, and event series analysis.

lmdbjavalmdbjava/lmdbjava

A Java binding for LMDB providing a low-latency, transactional, sorted, embedded key-value store with an idiomatic Java API.

OpenAMOpenIdentityPlatform/OpenAM

Open-source access management solution for identity authentication, authorization, and federation with single sign-on and centralized policy control.

next.jdbcseancorfield/next-jdbc

A modern, low-level Clojure wrapper for JDBC-based database access, designed for performance and simplicity.

WALAwala/WALA

A comprehensive static analysis library for Java bytecode and JavaScript, supporting interprocedural dataflow, pointer analysis, and call graph construction.

Stargatestargate/stargate

An open-source data API gateway that sits between applications and Cassandra, enabling multiple APIs and data models.

Heroicspotify/heroic

A scalable time series database built on Bigtable, Cassandra, and Elasticsearch for high-volume metrics.

Apache Samzaapache/samza

A distributed stream processing framework built on Apache Kafka and Apache Hadoop YARN for fault-tolerant, stateful processing.

reactive-grpcsalesforce/reactive-grpc

A suite of libraries for using gRPC with Reactive Streams programming models like RxJava and Spring Reactor.

iCal4jical4j/ical4j

A Java library for parsing and building iCalendar data models, supporting RFC standards for calendar data interchange.

Artemis-odbjunkdog/artemis-odb

A high-performance Java Entity-Component-System framework for game development, supporting Android, HTML5, and iOS.

TurbineNetflix/Turbine

A server-side event stream aggregator for Hystrix metrics from distributed services.

EasyMockeasymock/easymock

A Java library for creating mock objects to simplify unit testing.

FreeBuilderinferred/FreeBuilder

Automatic generation of the Builder pattern for Java 1.8+, reducing boilerplate for immutable value types.

GovernatorNetflix/governator

A library of extensions and utilities that enhance Google Guice with lifecycle management, classpath scanning, and configuration mapping.

SimpleNLGsimplenlg/simplenlg

A Java API for Natural Language Generation that handles morphological realization, text generation, and basic aggregation.

Spatialneo4j-contrib/spatial

A Neo4j library for importing, storing, and querying spatial data with support for multiple geometry types and spatial indexes.

structrstructr/structr

An open-source low-code development platform built on a graph database (Neo4j) for creating custom web apps, backends, and integration components.

graphql-java-toolsgraphql-java-kickstart/graphql-java-tools

A schema-first library for building GraphQL-Java schemas using the GraphQL schema language with automatic type mapping.

MultiViewAdapterDevAhamed/MultiViewAdapter

A library for creating complex RecyclerView adapters with multiple view types, selection, expansion, and drag-and-drop in Android.

jvppeteerfanyong920/jvppeteer

A Java API for controlling Chrome and Firefox browsers via DevTools and WebDriver-bidi protocols.

rxjava-jdbcdavidmoten/rxjava-jdbc

A reactive Java library for efficient, functional composition of database calls using JDBC and RxJava Observables.

react-native-workersdevfd/react-native-workers

Run background services and web workers in React Native apps, with persistent Android services that survive app closure.

suroNetflix/suro

A distributed data pipeline service for collecting, aggregating, and dispatching large volumes of application events and log data.

JSATEdwardRaff/JSAT

A pure Java machine learning library with no external dependencies, offering a wide collection of algorithms and parallel execution support.

Overlap2DUnderwaterApps/overlap2d

A 2D level and UI editor with engine-agnostic philosophy for game development, separating coding from content creation.

Hexworks/ZirconHexworks/zircon

An extensible, user-friendly tile engine and text GUI library for building roguelikes and terminal-style applications.

Vert.x blueprint - Microservice applicationsczyh30/vertx-blueprint-microservice

A blueprint for building reactive microservice applications using Vert.x, featuring a micro-shop example.

pcollectionshrldcpr/pcollections

A persistent and immutable Java collections library offering efficient, thread-safe alternatives to the Java Collections Framework.

Rockerfizzed/rocker

A Java 8+ optimized, memory-efficient, and speedy template engine that compiles templates into statically typed Java classes.

cactoosyegor256/cactoos

A collection of object-oriented Java primitives as an alternative to procedural libraries like Guava and Apache Commons.

JustWeEnginelfkdsk/JustWeEngine

An easy-to-use open source Android native game framework for building 2D games.

AChartEngineddanny/achartengine

A versatile charting library for Android applications supporting multiple chart types with high performance.

VisUIkotcrab/vis-ui

A libGDX UI toolkit providing enhanced scene2d.ui widgets and a polished skin for creating attractive desktop and mobile game interfaces.