NewPipe does not use any Google framework libraries, or the YouTube API. It only parses the website in order to gain the information it needs. Therefore this app can be used on devices without Google Services installed. Also, you don't need a YouTube account to use NewPipe, and it's FLOSS. Although NewPipe only supports YouTube at the moment, it's designed to support many more streaming services. The plan is, that NewPipe will get such support by the version 2.0.

NewPipe - A lightweight Youtube frontend for Android

Vue Native is a framework to build cross platform native mobile apps using JavaScript. It is a wrapper around the APIs of React Native. So, with Vue Native, you can do everything that you can do with React Native. With Vue Native, you get the simplicity of Vue.js and the seamless interop with React Native.


Vue Native - Framework to build cross platform native mobile apps using JavaScript

NativeBase is a sleek, ingenious and dynamic front-end framework created by passionate React Loving team at Geekyants.com to build cross platform Android & iOS mobile apps using ready to use generic components of React Native. What is really great with NativeBase is that you can use shared UI cross-platform components, which will drastically increase your productivity. When using NativeBase, you can use any native third-party libraries out of the box.

NativeBase - Essential cross-platform UI components for React Native

 This application provides display and control of Android devices connected on USB (or over TCP/IP). It does not require any root access. It works on GNU/Linux, Windows and MacOS. The Android part requires at least API 21 (Android 5.0). It supports screen capturing / mirroring Android device.

Scrcpy - Display and control your Android device

Sample Android Components Architecture on a modular word focused on the scalability, testability and maintainability written in Kotlin, following best practices using Jetpack. The goal of the project is to demonstrate best practices, provide a set of guidelines, and present modern Android application architecture that is modular, scalable, maintainable and testable. This application may look simple, but it has all of these small details that will set the rock-solid foundation of the larger app suitable for bigger teams and long application lifecycle management.

Android Components Architecture in a Modular Word

Joplin is a note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor. The notes are in Markdown format. Notes exported from Evernote via .enex files can be imported into Joplin, including the formatted content (which is converted to Markdown), resources (images, attachments, etc.) and complete metadata (geolocation, updated time, created time, etc.). Plain Markdown files can also be imported. Full text search is available on all platforms to quickly find the information you need. The app can be customised using plugins and themes, and you can also easily create your own.
It maintains Revisions (Note history), Synchronisation with various services, including Nextcloud, Dropbox, WebDAV and OneDrive. End To End Encryption, File attachment, Inline display of PDF, Geo-location and Multiple language support.

Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor. The notes are in Markdown format. 

Joplin - A note taking and to-do application with synchronization capabilities for Windows, macOS, Linux, Android and iOS

OpenKeychain is an OpenPGP implementation for Android. 

OpenKeychain - OpenPGP implementation for Android

A push notification micro server using Gin framework written in Go (Golang).

<ul>
<li>Support <a href="https://firebase.google.com/docs/cloud-messaging">Firebase Cloud Messaging</a> using <a href="https://github.com/appleboy/go-fcm">go-fcm</a> library for Android.</li>
<li>Support <a href="https://http2.github.io/">HTTP/2</a> Apple Push Notification Service using <a href="https://github.com/sideshow/apns2">apns2</a> library.</li>
<li>Support <a href="https://github.com/go-yaml/yaml">YAML</a> configuration.</li>
<li>Support command line to send single Android or iOS notification.</li>
<li>Support Web API to send push notification.</li>
<li>Support graceful restart &amp; zero downtime deploy using <a href="https://github.com/facebookgo/grace">facebook grace</a>.</li>
<li>Support <a href="https://http2.github.io/">HTTP/2</a> or HTTP/1.1 protocol.</li>
<li>Support notification queue and multiple workers.</li>
<li>Support <code>/api/stat/app</code> show notification success and failure counts.</li>
<li>Support <code>/api/config</code> show your <a href="https://en.wikipedia.org/wiki/YAML">YAML</a> config.</li>
<li>Support store app stat to memory, <a href="http://redis.io/">Redis</a>, <a href="https://github.com/boltdb/bolt">BoltDB</a>, <a href="https://github.com/tidwall/buntdb">BuntDB</a> or <a href="https://github.com/syndtr/goleveldb">LevelDB</a>.</li>
<li>Support <code>p12</code> or <code>pem</code> formtat of iOS certificate file.</li>
<li>Support <code>/sys/stats</code> show response time, status code count, etc.</li>
<li>Support for HTTP proxy to Google server (FCM).</li>
<li>Support retry send notification if server response is fail.</li>
<li>Support expose <a href="https://prometheus.io/">prometheus</a> metrics.</li>
<li>Support install TLS certificates from <a href="https://letsencrypt.org/">Let's Encrypt</a> automatically.</li>
<li>Support send notification through <a href="https://en.wikipedia.org/wiki/Remote_procedure_call">RPC</a> protocol, we use <a href="https://grpc.io/">gRPC</a> as default framework.</li>
</ul>

A push notification micro server using Gin framework written in Go (Golang).

gorush - A push notification server written in Go (Golang).

ObjectBox is a superfast object-oriented database with strong relation support. ObjectBox is embedded into your Android, Linux, macOS, or Windows app. ObjectBox is a mobile database built for objects from ground up (no ORM, no SQLite). The concise API is easy to learn and just takes a fraction of the code you need to work with SQLite. ACID properties and Multiversion Concurrency Control (MVCC) provide you with safe transactions and parallelism.

ObjectBox - Super fast database for Mobile and IoT

Smack is an open source, highly modular, easy to use, XMPP client library written in Java for Java SE compatible JVMs and Android.A pure Java library, it can be embedded into your applications to create anything from a full XMPP instant messaging client to simple XMPP integrations such as sending notification messages and presence-enabling devices. Smack and XMPP allows you to easily exchange data, in various ways e.g. fire-and-forget, publish-subscribe, between human and non-human endpoints (M2M, IoT, …).

Smack - A highly modular and portable open source XMPP client library written in Java for JVMs (JavaSE) and Android

raylib is a simple and easy-to-use library to learn videogames programming. raylib is highly inspired by Borland BGI graphics lib and by XNA framework and it's specially well suited for prototyping, tooling, graphical applications, embedded systems and education.
 
It supports Hardware accelerated with OpenGL, Unique OpenGL abstraction layer, Full 3D support, VR stereo rendering, Flexible Materials system, supporting classic maps and PBR maps and lot more.

raylib is a simple and easy-to-use library to learn videogames programming. raylib is highly inspired by Borland BGI graphics lib and by XNA framework and it's specially well suited for prototyping, tooling, graphical applications, embedded systems and education.


raylib - A simple and easy-to-use library to learn videogames programming

This project provides reverse tethering over adb for Android: it allows devices to use the internet connection of the computer they are plugged on. It does not require any root access (neither on the device nor on the computer). It works on GNU/Linux, Windows and Mac OS.

Gnirehtet - Reverse tethering for Android

Robolectric is the industry-standard unit testing framework for Android. With Robolectric, your tests run in a simulated Android environment inside a JVM, without the overhead and flakiness of an emulator. Robolectric tests routinely run 10x faster than those on cold-started emulators. Robolectric supports running unit tests for 16 different versions of Android, ranging from Jelly Bean (API level 16) to SV2 (API level 32).
 
Unlike traditional emulator-based Android tests, Robolectric tests run inside a sandbox which allows the Android environment to be precisely configured to the desired conditions for each test, isolates each test from its neighbors, and extends the Android framework with test APIs which provide minute control over the Android framework’s behavior and visibility of state for assertions.

Robolectric is the industry-standard unit testing framework for Android. With Robolectric, your tests run in a simulated Android environment inside a JVM, without the overhead and flakiness of an emulator. Robolectric tests routinely run 10x faster than those on cold-started emulators. Robolectric supports running unit tests for 16 different versions of Android, ranging from Jelly Bean (API level 16) to SV2 (API level 32).

Robolectric - Android Unit Testing Framework

Replicant is a fully free Android distribution running on several devices. Google decided to release Android SDK under an overall proprietary software license. Replicant comes for the rescue.

Replicant - Android Alternative

Ubuntu phone is a Ubuntu distribution which runs on mobile devices. With all-native core apps and no Java overhead, Ubuntu runs well on entry-level smartphones — yet it uses the same drivers as Android. So now it’s easy to bring a better experience to customers all over the world.

Ubuntu phone - Mobile Operating System from Ubuntu

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