Kotlin

LoggingInterceptorihsanbal/LoggingInterceptor

An OkHttp interceptor with a pretty logger for Android HTTP requests and responses, including mock support.

Sentry cgetsentry/sentry-java

Official Sentry SDK for error monitoring and performance tracking in Java, Android, and other JVM-based applications.

Mobiusspotify/mobius

A functional reactive framework for managing state evolution and side-effects in Android and JVM applications.

XodusJetBrains/xodus

A transactional, schema-less embedded database written in Java and Kotlin, used by JetBrains YouTrack and Hub.

InputMaskRedMadRobot/input-mask-android

An Android library for formatting user input with masks, supporting phone numbers, dates, serial numbers, and more.

KableJuulLabs/kable

A Kotlin Coroutines-powered library for asynchronous Bluetooth Low Energy (BLE) communication across multiple platforms.

Pact JVMDiUS/pact-jvm

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

Android Image Pickeresafirm/android-image-picker

A highly configurable yet easy-to-use image picker library for Android with camera integration.

Toothpickstephanenicolas/toothpick

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

jtecasid/jte

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

graphql-spqrleangen/GraphQL-SPQR

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

DSL-JSONngs-doo/dsl-json

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

DSL-JSONngs-doo/dsl-json

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

Kotlin coding puzzlesigorwojda/kotlin-coding-puzzle

A collection of Kotlin coding challenges with solutions and tests to practice algorithms and data structures.

Android Basic Samplesplaygameservices/android-basic-samples

Android sample apps demonstrating Google Play game services integration including leaderboards, achievements, and snapshots.

DbInspectorinfinum/android_dbinspector

Android library for viewing, editing, and sharing in-app SQLite databases directly on the device for debugging.

Zally ()zalando/zally

A minimalistic, simple-to-use linter for OpenAPI 2 and 3 specifications that checks compliance with RESTful guidelines.

KAndroidpawegio/KAndroid

A Kotlin library for Android providing useful extensions to eliminate boilerplate code and boost developer productivity.

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.

Hexworks/ZirconHexworks/zircon

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

photo_managerfluttercandies/flutter_photo_manager

A Flutter plugin for cross-platform media asset management, providing APIs to access and manage photos, videos, and audio without UI integration.

kmongoLitote/kmongo

A Kotlin toolkit for MongoDB providing native extensions, object mapping, and type-safe queries.

FingerprintJS Androidfingerprintjs/fingerprint-android

A lightweight Kotlin library for stateless device identification and fingerprinting on Android.

Flutter Reactive BLEPhilipsHue/flutter_reactive_ble

A Flutter library for reactive Bluetooth Low Energy (BLE) operations supporting multiple device connections.

/fix-github-issuejeremymailen/kotlinter-gradle

A Gradle plugin for linting and formatting Kotlin code using ktlint with zero configuration and fast incremental builds.

gdx-liftofftommyettinger/gdx-liftoff

A modern GUI setup tool for generating and configuring libGDX Gradle projects with extensive customization options.

CrunchyCalendarCleverPumpkin/CrunchyCalendar

A lightweight, customizable Android calendar widget with infinite scroll, multiple selection modes, and visual indicators.

Atriumrobstoll/atrium

A multiplatform expectation library for Kotlin with fluent APIs, extensible design, and detailed failure reporting.

RxReplayingShareJakeWharton/RxReplayingShare

An RxJava transformer that combines replay(1), publish(), and refCount() operators for efficient value caching.

Hexagonhexagonkt/hexagon

A Kotlin microservices toolkit for building server applications (web apps, APIs, serverless) with a modular, pluggable architecture.

flutter_vlc_playersolid-software/flutter_vlc_player

A Flutter plugin providing a VLC-powered video player for iOS and Android with advanced playback features.

Android FHIR SDKgoogle/android-fhir

A set of Kotlin libraries for building offline-capable, mobile-first healthcare applications using the HL7 FHIR standard on Android.

Koolfabmax/kool

A Kotlin multiplatform graphics engine supporting Vulkan, WebGPU, and OpenGL for desktop, Android, and web.

AyzaHakky54/ayza

A high-level SSL/TLS configuration library for Java, Kotlin, and Scala HTTP clients and servers with hot reloading and rich utilities.

Kotlin MVVM exampleemedinaa/kotlin-mvvm

A sample Android app demonstrating MVVM architecture in Kotlin using ViewModel, LiveData, Retrofit, and testing libraries.