It's foolish to think open source isn't possible on Android.

This page summarizes the projects mentioned and recommended in the original post on /r/fossdroid

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  • block

    Let's make an annoyance free, better open internet, altogether!

    Energized Protection is a database of websites to block using the hosts file. Check out its official repository for more information.

  • koler

    Just a phone app.

    Phone app (Dialer): Go ahead and install Koler or Simple Dialer. NoPhoneSpam can be used to block based on patterns. Call Recorder can be used to record your calls, use Call Recorder - Skvalex (closed source) with its Magisk module if it doesn't work. Use Share my number if you need to share your number with a QR code.

  • InfluxDB

    Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  • ungoogled-chromium-android

    Discontinued Android build for ungoogled-chromium

    Browser: It might sound surprising but this is the easiest part. If you're using Chrome, install Bromite or Ungoogled Chromium. If you're using Firefox, install Mull. There are some simpler browsers, you can test them out if you want. For syncing bookmarks, use xBrowserSync.

  • mollyim-android

    Enhanced and security-focused fork of Signal.

    Whatsapp: Jami has come a long way, use it if you have people who'd be interested in an open source P2P Whatsapp alternative that doesn't require any signup or phone number. If not, then use Signal, if that still doesn't work for you, no alternatives. If Whatsapp releases the feature that you can use Whatsapp Web without your phone online, Whatsapp Web To Go will be useful. Try Open In Whatsapp if you need to text people not in your contacts.

  • hardened_malloc

    Hardened allocator designed for modern systems. It has integration into Android's Bionic libc and can be used externally with musl and glibc as a dynamic library for use on other Linux-based platforms. It will gain more portability / integration over time.

    Arguably the most drastic change. Go to your device's Xda forum page and pick a rom for yourself. Don't be fooled by the number of options, almost all are based on AOSP, LineageOS, or GrapheneOS. If the rom has a different name than these three, then it has further customizations, which can be a great thing, though make sure it's not bloated.

  • new-clock

    The best clock app there is

    Clock: Yes, even the default clock app can be changed, so why not? Try Clock (the new version).

  • acc

    Advanced Charging Controller

    ACC is required to use AccA.

  • WorkOS

    The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  • bromite

    Bromite is a Chromium fork with ad blocking and privacy enhancements; take back your browser!

    Browser: It might sound surprising but this is the easiest part. If you're using Chrome, install Bromite or Ungoogled Chromium. If you're using Firefox, install Mull. There are some simpler browsers, you can test them out if you want. For syncing bookmarks, use xBrowserSync.

  • SeekerAndroid

    Android client for the Soulseek peer-to-peer network

    Music: Newpipe (casual), Seeker (hq) to save locally. Vanilla to play local music. Blade if you're paying Spotify or want Deezer's library.

  • blade-player

    Discontinued Android music player that plays from local library, Spotify or Deezer

    Music: Newpipe (casual), Seeker (hq) to save locally. Vanilla to play local music. Blade if you're paying Spotify or want Deezer's library.

  • phimpme-android

    Phimp.me Photo Imaging and Picture Editor https://play.google.com/store/apps/details?id=org.fossasia.phimpme

    Snapspeed: The closest thing you're getting is Phimp.me, which is far from a polished app. Don't use an image editing app, try Phimp.me if you must, go with Snapspeed if you really need those features.

  • joplin-android

    Android releases for Joplin

    Google Keep: This app is so basic that most open source note taking apps should suffice. As for the top editors, Joplin is good, can sync pretty well and even has error correction tools in case sync goes wrong, but you can't attach files bigger than 10 MB to notes. Neutrinote CE is almost just as good, it even has basic sketching feature but you can't attach anything other than images. Markor has terrible UX but it has good attachment support.

  • Collabora Online

    Collabora Online is a collaborative online office suite based on LibreOffice technology. This is also the source for the Collabora Office apps for iOS and Android.

    Google Docs/Slides/Sheets: OpenOffice Document Reader can read and edit, but don't expect much. Collabora Office is a way better editor, it works but doesn't have as many features as Google Docs does. Neither of these options offer collaboration. Padland has collab through Etherpad but it's well-known how hard it is to get everyone you are working with switch to another app.

  • Athena

    Discontinued A free and open source replacement for Google Assistant on Android devices, meant to integrate with the Sapphire Framework. It contains both speech-to-text and text-to-speech services. It does not require Google services or network connectivity [Moved to: https://github.com/Tadashi-Hikari/Sapphire] (by Tadashi-Hikari)

    Google Assistant: Dicio is already on F-Droid but it won't get what you are saying. Possible actions are limited. There's also Athena that's in development, though it is not ready for any kind of use. Depending on whether you need some sort of an accessibility service, you can get away with ditching Ok Google / Alexa / Cortana / Bixby. TalkBack should help with it too.

  • LibreraReader

    Book Reader for Android

    Google Play Books: Aurora to get books, Librera Reader to read them, Badreads to log/review them.

  • audiohq_md2

    A tool to control android application volume individually, TRUE adjusting not auto adjust script, for native and more information check the website

    Samsung SoundAssistant: Audio HeadQuarter works the same way with its Magisk module, is also way more customizable.

  • SeriesGuide

    Track your favorite TV shows and movies on Android devices.

    Trakt: Episodes for series (still needs some work for an enjoyable experience). Nekome can be used for anime and manga if you trust Kitsu. CineLog and Movie DB can both act as a database where you save movies or look up other movies, but they aren't actively developed and lack organization features. This is where SeriesGuide comes into play. It isn't on F-Droid and "tracks or reports your" activity but it can help you group and organize your series and movies. It has also premium features that require a monthly subscription.

  • CloudStream-3

    Discontinued Android app for streaming and downloading Movies, TV-Series and Anime. [UnavailableForLegalReasons - Repository access blocked]

    Any streaming app (Hulu, Netflix...): Cloudstream-3.

  • OpenScan

    A privacy-friendly Document Scanner app

    CamScanner, Office Lens: OpenScan will get you covered. Don't use the 155 MB spyware CamScanner.

  • CollinsDictionary

    This is a multi-platform Collins Dictionary client, supports for Desktop(Windows/Linux/MacOS) and Android.

    Merriam-Webster DIctionary: CollinsDictionary (MW alternative), Notification Dictionary (simple text definitions), WordBook (personal dictionary).

  • Num-Plus-Plus

    A scientific & intutive calculator written in Flutter.

    Calculator: You don't notice how infrequently you use your calculator app until you delete it. For simple calculations, Blue Line Console can act as the most unobtrusive calculator. For complex calculations, try num++ or MicroMathematics Plus (plots, graphs). If you happen to make simple calculations frequently, there's Calculator Notification.

  • exif-eraser

    Permissionless image metadata erasing application for Android

    Metadata eraser: Prefer Imagepipe (over ScrambledExif) for quickly cropping, scaling, and sharing images because it is lighter and still have more features. ExifEraser to erase metadata of all images in a directory.

  • DialogMusicPlayer

    A simple and minimal music player dialog :)

    Quick music player: Dialog Music Player is useful when you want to listen to an audio file in your files app.

  • orbot

    The Github home of Orbot: Tor on Android (Also available on gitlab!)

    Orbot: Tor proxy.

  • WebviewManager-Module

    WebView Manager is a magisk module to change your webview and browser to one of your choice.

    Webview Manager allows you to replace the webview installed on your phone with Bromite or Ungoogled Chromium's webviews (or a custom one if you wish). The webview installed can be updated through an F-Droid app, they are updated also when you update the module.

  • De-Bloater

    An application using the power of Magisk to debloat unwanted system apps!

    De-bloater companion magisk module.

  • disable-screenshot-camera-sounds

    disable-screenshot-camera-sounds

    Disable screenshot and camera sounds disables screenshot and shutter sounds in case your rom does not offer an option to do so.

  • energizedprotection

    Energized Protection Magisk Module.

    Energized Protection is a database of websites to block using the hosts file. Check out its official repository for more information.

  • MagiskHidePropsConf

    This tool is now dead...

    MagiskHidePropsConfig can be used to change your devie's fingerprint and pass the SafetyNet test. You may need this app if you want to run banking apps.

  • callrecorder-skvalex

    callrecorder-skvalex

    Call Recorder - SKVALEX is the module needed to record calls using the closed source call recording app.

  • Lawnchair

    Discontinued No clever tagline needed

    You can try new Lawnchair alpha 4

  • SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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