Kotlin

kotlin-fakerserpro69/kotlin-faker

A Kotlin/JVM library for generating realistic fake data like names, addresses, and banking details for testing and anonymization.

Audiogramalxrm/audiowave-progressbar

A lightweight audiowave progressbar for Android, written in Kotlin, that can also function as a seekbar.

Kotlin for Apache SparkKotlin/kotlin-spark-api

Kotlin bindings and extensions for Apache Spark, enabling idiomatic Kotlin development with data classes, lambdas, and null safety.

OneAdapterironSource/OneAdapter

A modular, viewholderless adapter for Android RecyclerView with built-in diffing, paging, emptiness, selection, and event hooks.

ConfigurateSpongePowered/Configurate

A Java configuration library with a node-based data model, multiple format support, and transformation tools.

BlueFalconReedyuk/blue-falcon

A Kotlin Multiplatform Bluetooth Low Energy (BLE) library providing a unified API for iOS, Android, macOS, Windows, JavaScript, and Raspberry Pi.

ARCore Plugingiandifra/arcore_flutter_plugin

A Flutter plugin for building augmented reality experiences on Android using ARCore.

react-native-hole-viewibitcy/react-native-hole-view

A React Native component that creates touch-through holes in overlays, ideal for tutorial and onboarding flows.

NFC Readermatteocrippa/flutter-nfc-reader

A Flutter plugin for reading and writing NFC tags on iOS and Android devices.

ActivityStarterMarcinMoskala/ActivityStarter

An Android library that simplifies starting Activities, Fragments, Services, and BroadcastReceivers with arguments using annotations.

LogCaptorHakky54/log-captor

A Java library for capturing log entries in unit and integration tests without mocking or custom extensions.

Google Map Viewapptreesoftware/flutter_google_map_view

A Flutter plugin for displaying Google Maps on iOS and Android, offering interactive maps, markers, polylines, and polygons.

elm-pluginklazuka/intellij-elm

An IntelliJ Platform plugin providing comprehensive IDE support for the Elm programming language.

WebTautestingisdocumenting/webtau

A unified testing API, CLI, and framework for writing unit, integration, and end-to-end tests across REST-API, WebSocket, GraphQL, Browser, Database, and CLI.

AutoParamsAutoParams/AutoParams

A JUnit 5 extension for automatic test data generation in Java and Kotlin, eliminating manual setup for parameterized tests.

Cloudopt Nextcloudoptlab/cloudopt-next

A lightweight, modern JVM-based web framework built on Vert.x for Java and Kotlin applications.

SVT Encoresvt/encore

A scalable video transcoding tool built on FFmpeg and Spring Boot, designed for VOD pipelines.

Android Clean Architecture - Kotlinpatrickyin/clean-architecture-android-kotlin

A clean architecture base project for Android using Kotlin, Dagger2, and RxJava to isolate UI, business logic, and data layers.

Android Kotlin Samplesirontec/android-kotlin-samples

A collection of basic Kotlin code samples demonstrating common Android development patterns and libraries.

Kotlin DDD Samplefabriciorissetto/kotlin-ddd-sample

A sample Domain-Driven Design and CQRS project built with Kotlin and Spring, demonstrating a layered architecture for order management.

astminerJetBrains-Research/astminer

A Kotlin library for extracting path-based code representations and ASTs from multiple languages to prepare code for machine learning models.

KMQTTdavidepianca98/KMQTT

A Kotlin Multiplatform MQTT 3.1.1/5.0 client and embeddable/standalone broker targeting multiple platforms.

methanolmizosoft/methanol

Lightweight HTTP extensions for Java's built-in HttpClient, adding multipart uploads, caching, decompression, and object mapping.

WowAhoo-Wang/Wow

A Kotlin/Java framework for building reactive, event-sourced microservices using DDD and CQRS patterns.

Live Activitiesistornz/live_activities

A Flutter plugin for implementing iOS Live Activities & Dynamic Island and Android RemoteViews in cross-platform apps.

Timeconalxrm/animated-clock-icon

An easy-to-use animated clock icon library for Android, written in Kotlin with customizable time display and animations.

VoiceOverlayalgolia/voice-overlay-android

An Android overlay that handles voice permission and converts user speech to text with a customizable UI.

Insecureshopoptiv/insecureshop

An intentionally vulnerable Android shopping app built in Kotlin for security education and penetration testing practice.

rust_android_iosivnsch/rust_android_ios

Example project demonstrating how to share Rust core logic between native Android and iOS mobile applications.

Godot Google Play Game ServicesIakobs/godot-play-game-services

A Godot 4.x plugin for integrating Google Play Game Services SDK into Android games.

junit-dataproviderTNG/junit-dataprovider

A TestNG-like data provider runner for JUnit with many additional features for parameterized testing.

react-native-loader-kitmaitrungduc1410/react-native-loader-kit

A React Native library providing 30+ beautiful, customizable loading animations with speed control.

SCEEHelium314/SCEE

An advanced OpenStreetMap surveyor app for experienced contributors, offering enhanced editing capabilities beyond StreetComplete.

Biometric Authaparajita/capacitor-biometric-auth

A Capacitor plugin providing comprehensive access to native biometric authentication APIs on iOS, Android, and web.

Actionbasekakao/actionbase

A specialized database for social interactions (likes, views, follows) that precomputes data at write time for real-time, high-scale reads.

ConvalidaWellingtonCosta/convalida

A simple, lightweight, and powerful field validation library for Android applications.