okhttp
Squareโs meticulous HTTP client for the JVM, Android, and GraalVM.retrofit
A type-safe HTTP client for Android and the JVMleakcanary
A memory leak detection library for Android.picasso
A powerful image downloading and caching library for Androidjavapoet
A Java API for generating .java source files.moshi
A modern JSON library for Kotlin and Java.okio
A modern I/O library for Android, Java, and Kotlin Multiplatform.dagger
A fast dependency injector for Android and Java.crossfilter
Fast n-dimensional filtering and grouping of records.PonyDebugger
Remote network and data debugging for your native iOS app using Chrome Developer Toolsmaximum-awesome
Config files for vim and tmux.otto
An enhanced Guava-based event bus with emphasis on Android support.cubism
Cubism.js: A JavaScript library for time series visualization.sqlbrite
A lightweight wrapper around SQLiteOpenHelper which introduces reactive stream semantics to SQL operations.android-times-square
Standalone Android widget for picking a single date from a calendar view.wire
gRPC and protocol buffers for Android, Kotlin, Swift and Java.Valet
Valet lets you securely store data in the iOS, tvOS, watchOS, or macOS Keychain without knowing a thing about how the Keychain works. Itโs easy. We promise.cube
Cube: A system for time series visualization.kotlinpoet
A Kotlin API for generating .kt source files.java-code-styles
IntelliJ IDEA code style settings for Square's Java and Android projects.flow
Name UI states, navigate between them, remember where you've been.spoon
Distributing instrumentation tests to all your Androids.keywhiz
A system for distributing and managing secretstape
A lightning fast, transactional, file-based FIFO for Android and Java.certstrap
Tools to bootstrap CAs, certificate requests, and signed certificates.mortar
A simple library that makes it easy to pair thin views with dedicated controllers, isolated from most of the vagaries of the Activity life cycle.go-jose
An implementation of JOSE standards (JWE, JWS, JWT) in GoCleanse
Lightweight Swift Dependency Injection Frameworkassertj-android
A set of AssertJ helpers geared toward testing Android.haha
DEPRECATED Java library to automate the analysis of Android heap dumps.phrase
Phrase is an Android string resource templating librarycane
Code quality threshold checking as part of your buildanvil
A Kotlin compiler plugin to make dependency injection with Dagger 2 easier.seismic
Android device shake detection.sudo_pair
Plugin for sudo that requires another human to approve and monitor privileged sudo sessionssquare.github.io
A simple, static portal which outlines our open source offerings.spacecommander
Commit fully-formatted Objective-C as a team without even trying.workflow
A Swift and Kotlin library for making composable state machines, and UIs driven by those state machines.workflow-kotlin
A Swift and Kotlin library for making composable state machines, and UIs driven by those state machines.certigo
A utility to examine and validate certificates in a variety of formatslogcat
I CAN HAZ LOGZ?radiography
Text-ray goggles for your Android UI.whorlwind
Makes fingerprint encryption a breeze.dagger-intellij-plugin
An IntelliJ IDEA plugin for Dagger which provides insight into how injections and providers are used.cycler
Paralayout
Paralayout is a set of simple, useful, and straightforward utilities that enable pixel-perfect layout in iOS. Your designers will love you.apropos
A simple way to serve up appropriate images for every visitor.shift
shift is an application that helps you run schema migrations on MySQL databasescoordinators
Simple MVWhatever for Androidsubzero
Block's Bitcoin Cold Storage solution.Blueprint
Declarative UI construction for iOS, written in Swiftshuttle
String extraction, translation and export tools for the 21st century. "Moving strings around so you don't have to"gifencoder
A pure Java library implementing the GIF89a specification. Suitable for use on Android.pollexor
Java client for the Thumbor image service which allows you to build URIs in an expressive fashion using a fluent API.intro-to-d3
a D3.js tutorialkochiku
Shard your builds for fun and profitcurtains
Lift the curtain on Android Windows!svelte-store
RxIdler
An IdlingResource for Espresso which wraps an RxJava Scheduler.burst
A unit testing library for varying test data.field-kit
FieldKit lets you take control of your text fields.SuperDelegate
SuperDelegate provides a clean application delegate interface and protects you from bugs in the application lifecycleotto-intellij-plugin
An IntelliJ IDEA plugin to navigate between events posted by Otto.js-jose
JavaScript library to encrypt/decrypt data in JSON Web Encryption (JWE) format and to sign/verify data in JSON Web Signature (JWS) format. Leverages Browser's native WebCrypto API.sharkey
Sharkey is a service for managing certificates for use by OpenSSHconnect-api-examples
Code samples demonstrating the functionality of the Square Connect APIfdoc
Documentation format and verificationETL
Extract, Transform, and Load data with Rubylgtm
Simple object validation for JavaScript.papa
PAPA: Performance of Android Production Applicationslaravel-hyrule
Object-oriented, composable, fluent API for writing validations in Laravelin-app-payments-flutter-plugin
Flutter Plugin for Square In-App Payments SDKpylink
Python Library for device debugging/programming via J-Linkworkflow-swift
A Swift and Kotlin library for making composable state machines, and UIs driven by those state machines.pysurvival
Open source package for Survival Analysis modelingrails-auth
Modular resource-based authentication and authorization for Rails/Rackcocoapods-generate
A CocoaPods plugin that allows you to easily generate a workspace from a podspec.inspect
inspect is a collection of metrics gathering, analysis utilities for various subsystems of linux, mysql and postgres.Aardvark
Aardvark is a library that makes it dead simple to create actionable bug reports.gradle-dependencies-sorter
A CLI app and Gradle plugin to sort the dependencies in your Gradle build scriptsjetpack
jet.pack: package your JRuby rack app for Jetty.luhnybin
auto-value-redacted
An extension for Google's AutoValue that omits redacted fields from toString().protoparser
Java parser for .proto schema declarations.squalor
Go SQL utility libraryListable
Declarative list views for iOS apps.p2
Platypus Platform: Tools for Scalable Deploymentmimecraft
Utility for creating RFC-compliant multipart and form-encoded HTTP request bodies.git-fastclone
git clone --recursive on steroidszapp
Continuous Integration for KIFmetrics
Metrics Query Engineruby-rrule
RRULE expansion for Rubyquotaservice
The purpose of a quota service is to prevent cascading failures in micro-service environments. The service acts as a traffic cop, slowing down traffic where necessary to prevent overloading services. For this to work, remote procedure calls (RPCs) between services consult the quota service before making a call. The service isnโt strictly for RPCs between services, and can even be used to apply quotas to database calls, for example.wire-gradle-plugin
A Gradle plugin for generating Java code for your protocol buffer definitions with Wire.goprotowrap
A package-at-a-time wrapper for protoc, for generating Go protobuf code.beancounter
Utility to audit the balance of Hierarchical Deterministic (HD) wallets. Supports multisig + segwit wallets.rce-agent
gRPC-based Remote Command Execution Agentwomeng_handbook
Everything you need to start or expand a women in engineering group in your community.cocoapods-check
A CocoaPods plugin that shows differences between locked and installed Podspoint-of-sale-android-sdk
A simple library for letting Point of Sale take in-store payments for your app using Point of Sale API.Love Open Source and this site? Check out how you can help us