This is a list of Alternative and Open Source Android Apps and OS I could recommend because I use most of them since November 2013 under Paranoid Android with a Nexus 5.
Most of these apps are available via F-Droid.
DiskUsage provides a way to find out which files and directories on the SD card of your Android phone are consuming the most space. It displays diagram with directories/subdirectories proportional to their size. Users are allowed to zoom in to look at specific directory content.
A fork of the last GPL version of EBookDroid. Supports the following formats:
Comic Books (cbz) (NO support for cbr (rar compressed))
FictionBook (fb2, fb2.zip)
Collaboration with electronic publication sites and access to online ebook catalogs is allowed by the supported OPDS protocol.
Kimai is a free open source timetracker. It tracks work time and prints out a summary of your activities on demand. Yearly, monthly, daily, by customer, by project, by action …
It’s simplicity is its strength. Due to Kimai’s web browser based interface it runs cross-platform. Likewise you can install it as a web service or as a single-user program on your local workstation.
NewPipe is a lightweight YouTube front-end for Android.
It doesn't need the YouTube-API or any Google Play Services, as NewPipe only parses the YouTube 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.
Display general information about a video
Watch YouTube videos
Listen to YouTube videos (experimental)
Select the streaming player to watch the video with
Download audio only
Open a video in Kodi
Show Next/Related videos
Search YouTube in a specific language
Watch age restricted material
Display general information about channels
Helps access and share practical educational content on digital security
This app exists as a part of a digital platform which will provide essential digital security information.
The platform aims to provide:
Concise and easy to understand content
The ability to browse and search for specific content
Adaptive content that supports self-guided learning
Selective downloading of content for limited data usage and offline reading
Multi-platform access, including older Android versions
Anonymous access to content and no identifiable user data
Open Mentoring exists as a learning content delivery system within a broader ecosystem of content which includes adapting content and establishing partnerships with sources such as: Security in a Box by the Tactical Technology Collective, The Umbrella app by Security First, The Story Maker app by Free Press Unlimited, Scalio, and the Guardian Project, SSD by the Electronic Frontier Foundation, The Digital First Aid Kit by the Digital Defenders Partnership, Level Up by Internews, the Panic Button app by iilab, TOTEM by Greenhost.
Telegram is a messaging app created by former VK creators with a focus on speed and security. It’s superfast, simple and free. It is like SMS, but more powerful.
You can send messages, photos and videos to people who are in your phone contacts (and have Telegram). You can also create groups for up to 20000 people or channels for unlimited subscribers.
For those interested in maximum privacy, Telegram added Secret Chats, featuring end-to-end encryption to ensure that a message can only be read by its intended recipient.
Telegram's client-side code is open-source software, whereas its server-side code is closed-source and proprietary. The service also provides public APIs with which developers can access the same functionality as Telegram's official apps to build their own messaging applications.
Telegram also provides a bot API for programmers to create different kinds of Telegram bots. Bots are simply Telegram accounts operated by software – not people – and they'll often have AI features. They can do anything – teach, play, search, broadcast, remind, connect, integrate with other services, or even pass commands to the Internet of Things.
TTRSS-Reader is a client application for the project Tiny Tiny RSS , a PHP-based online feedreader which runs on your own webspace. If you want to host your own feedreader, want a cross-device-solution and don't want to use Google Reader this is your app! TTRSS-Reader offers automatic update on startup, filtering articles by status and efficient browsing through categories and the virtual categories "Fresh", "Starred" and "Published Articles" as well as Labels which you can define by yourself. You can browse the articles offline when they have been synchronized before and the ImageCache can be used to pre-load all included images from the articles too.
VLC is a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols.
Simple, fast and powerful media player.
Plays everything: Files, Discs, Webcams, Devices and Streams.
Plays most codecs with no codec packs needed:
MPEG-2, DivX, H.264, MKV, WebM, WMV, MP3...
VyprVPN is a fast and secure way to browse the web. VyprVPN replaces your real IP address with an IP address from one of their many worldwide VPN server clusters protecting your privacy while online.
All plans include VyprDNS, Golden Frog's own encrypted, Zero-Logging DNS service which replaces the need for 3rd party DNS and defeats censorship via DNS man-in-middle-attacks or filtering.
Chameleon proprietary protocol is proven to help users that live in or travel to countries such as China, Russia and Turkey.
Mac, Windows, Android, iOS and Linux.
With VyprVPN active, all Internet communication from your PC gets encrypted and sent through VyprVPN's servers. Sites that try to identify you by your IP address get VyprVPN's IP address instead. If they attempt geo-location, they'll get VyprVPN's location.
VyprVPN unblocks websites that are restricted due to your IP location. You can experience the Internet as if you are browsing from any of their server locations which are placed strategically around the world.
Desktop apps for Windows and Mac.
VyprVPN mobile apps for iOS and Android
Free Cyphr Encrypted Messaging.
Desktop, mobile and web apps available.
wallabag is an opensource self hostable application for saving web pages.
wallabag extracts the article's content (and only its content!) and displays it in a comfortable view.
Moreover, wallabag is responsive: you can read your articles on your smartphone or your tablet.
Android, iOS or Windows Phone: wallabag application is available for your smartphone.
It's so easy to read your saved articles on your phone. And it also works when you're offline!
If you already have an account on Pocket©, Readability©, Instapaper© or even wallabag, you can import your data into wallabag.
wallabag provides a powerful tool to filter your saved articles. It's so easy to look for them.
wallabag is translated into more than ten languages. If yours is not yet available, please help translate.
All your data belongs to you. You can download all your articles in many formats: PDF, ePUB, .mobi, JSON, CSV, txt or HTML.
Wifi Analyzer is a handy tool which helps you to select a better channel for your wireless router. It turns you android phone into a handy Wi-Fi analyzer!
App Permissions (from Google Play)
Version 3.8.5 can access:
-modify or delete the contents of your USB storage
-test access to protected storage
-view Wi-Fi connections
-connect and disconnect from Wi-Fi
-prevent device from sleeping
-full network access
-view network connections
Zoiper IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client, meant to work with any IP-based communications systems and infrastructure.
Zoiper Classic BIZ provides secure high-quality voice calls and conference, fax sending and receiving functionality, and enhanced IP-calling features wrapped in a compact interface and small download size.
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