Kotlin

spark-nlpJohnSnowLabs/spark-nlp

A state-of-the-art Natural Language Processing library built on Apache Spark, offering 100,000+ pretrained models and pipelines in 200+ languages.

apollo-androidapollographql/apollo-android

A strongly-typed, caching GraphQL client for the JVM, Android, and Kotlin multiplatform.

SpotlightTakuSemba/Spotlight

An Android library for creating interactive tutorial spotlights that highlight UI elements with custom shapes and effects.

Material Dots Indicatorstommybuonomo/dotsindicator

An Android library providing customizable dot indicators for ViewPagers, available for both Jetpack Compose and XML layouts.

react-native-iapdooboolab/react-native-iap

A high-performance, OpenIAP-compliant in-app purchase library for React Native with cross-platform support.

requeryrequery/requery

A modern SQL-based object mapping and query library for Java, Kotlin, and Android with RxJava and Java 8 support.

KorGEkorlibs/korge

A modern multiplatform game engine for Kotlin, enabling game development for JVM, JS, WASM, iOS, and Desktop.

react-native-camera-kitwix/react-native-camera-kit

A high-performance, easy-to-use camera library for React Native apps with QR/barcode scanning.

driver-kotlin-coroutinemongodb/mongo-java-driver

Official MongoDB drivers for Java, Kotlin, and Scala applications to interact with MongoDB databases.

MultiSnapRecyclerViewTakuSemba/MultiSnapRecyclerView

An Android library for adding multiple snapping behavior to RecyclerView with customizable gravity and snap intervals.

Android Modular ArchitectureVMadalin/kotlin-sample-app

A sample Android app demonstrating a modular architecture with Kotlin and Jetpack, focused on scalability, testability, and maintainability.

AnyChartAnyChart/AnyChart-Android

A comprehensive data visualization library for creating interactive charts in Android apps with dozens of built-in chart types.

Nordic Semiconductor BLE SDK for AndroidNordicSemiconductor/Android-BLE-Library

An Android library that solves common Bluetooth Low Energy problems, making BLE development easier and more reliable.

KotterknifeJakeWharton/kotterknife

A Butter Knife-inspired view binding library for Android written in Kotlin, now deprecated.

react-native-blurhashmrousavy/react-native-blurhash

A React Native library for displaying colorful blurred image placeholders using BlurHash strings.

Lichess mobilelichess-org/lichobile

The former official mobile app for lichess.org, a free and open-source online chess platform.

Official Clientmastodon/mastodon-android

Official Android client for connecting to Mastodon servers and accessing the decentralized social network.

Yaade (.9k)EsperoTech/yaade

An open-source, self-hosted, collaborative API development environment for teams to securely manage and share API collections.

AndrOBDfr3ts0n/AndrOBD

An open-source Android app for OBD-II vehicle diagnostics using any ELM327 adapter.

AwesomeQRCode (Kotlin) WSumiMakito/AwesomeQRCode

A highly customizable QR code generator library for Android with support for logos, backgrounds, and animations.

ParparVMcodenameone/CodenameOne

Cross-platform framework for building truly native mobile apps with Java or Kotlin, supporting iOS, Android, Desktop & Web.

Codename Onecodenameone/CodenameOne

A cross-platform framework for building truly native mobile apps with Java or Kotlin, supporting iOS, Android, Desktop, and Web.

graphql-kotlinExpediaGroup/graphql-kotlin

A collection of libraries for building and running GraphQL clients and servers in Kotlin.

HabiticaHabitRPG/habitica-android

Native Android app for Habitica, a gamified habit-building and productivity platform.

InQL Scannerdoyensec/inql

A Burp Suite extension for advanced GraphQL security testing, featuring vulnerability scanning, batch attacks, and schema analysis.

Datafakerdatafaker-net/datafaker

A modern Java/Kotlin/Groovy library for generating realistic fake data with extensive providers and format support.

Flashbararitraroy/Flashbar

A highly customizable, powerful and easy-to-use alerting library for Android, built with Kotlin.

Gradle buildSrcVersionsjmfayard/buildSrcVersions

A Gradle plugin that automates dependency version management and updates, eliminating manual searches.

SectionedRecyclerViewAdapterluizgrp/SectionedRecyclerViewAdapter

An Android RecyclerView adapter that splits lists into sections with headers, footers, and individual state control.

firebase-kotlin-sdkGitLiveApp/firebase-kotlin-sdk

A Kotlin-first, multiplatform SDK for Firebase, enabling shared code across iOS, Android, Desktop, and Web.

KotlinDLJetBrains/KotlinDL

A high-level Deep Learning API for JVM and Android developers, written in Kotlin and inspired by Keras.

Kotlin-Pokedexmrcsxsiq/Kotlin-Pokedex

A Pokedex Android app built with Kotlin and modern Android architecture components like ViewModel, LiveData, Room, and Navigation.

graphql-spring-bootgraphql-java-kickstart/graphql-spring-boot

A Spring Boot starter for GraphQL servers with built-in support for GraphiQL, Altair, Playground, and Voyager.