Book Reader - Based on FBReader book reader with a simple UI.Frostwire - A file sharing client, media player and simple file manager for your Android devices.LibreTorrent - Copylefted libre full-featured torrent client for Android.Video-Transcoder - Android app for video and audio transcoder, based on FFmpeg.Standard Notes - A free, open-source, and completely encrypted notes app.

Simple Voice Recorder - An easy way of recording any discussion or sounds without ads or internet access.Simple Flashlight - A simple flashlight without ads.Simple Dialer - A handy phone call manager with phonebook, number blocking and multi-SIM support.Simple Contacts - A premium app for contact management with no ads, supports groups and favorites.

Simple Clock - A combination of a clock, alarm, stopwatch and timer.

Simple Calendar - Be notified of the important moments in your life.

Simple Calculator - A calculator for your quick calculations.Koler - A uniquely stylized phone app, with customizable features - for Android.Etar - It is a material designed open source calendar.Binary Eye - Barcode and QR code scanner without ads.Foxy Droid - Yet another F-Droid client.Aurora Store - Unofficial FOSS client to Google Play Store (Root permission is optional).Aurora Droid - Fork of the F-Droid client with external repos ready to sync (Root permission is optional).F-Droid - F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform.RethinkDNS + Firewall - DNS over HTTPS / DNS over Tor / DNSCrypt client, firewall, and connection tracker for Android.NetGuard - NetGuard provides simple and advanced ways to block access to the internet - no root required.DNS66 - DNS66 blocks advertisements on Android by intercepting DNS requests using Android's VPN layer and blocking requests for blacklisted hosts.DNSfilter - Ad blocker for Android using a VPN, supports hosts files.Blokada - Ad blocker for Android using the VPN API.AdAway - Ad blocker for Android using the hosts file (Root permission is optional but it is recommended).A curated list of awesome open source Android applications, tutorials and resources.

Android app source code github