A browser that blocks ads and trackers.
This is an active fork of the abandonned bromite browser. For people that don't like brave or want a foss chromium browser without crypto bullshit.
If you are firefox person this is a continuation fork of Mull (RIP), which was the best firefox fork for Android with tons of privacy improvments. With support for mobile extension such as 
uBlock Origin
Worth mentioning :
Fennec F-Droid (fully libre (free as in freedom) firefox build for android)
Firefox Focus (private browsing only)
To count the days before an event
Worth mentioning : 
Left (Android) with a dot based design instead of numbers.
The best free (as in free beer) PDF editor for Android (also one of the best free option on Desktop) and a really good PDF reader too
Free e-book downloader and reader that gets files from popular Shadow Libraries such as 
Anna’s Archive
Worth mentioning : 
Myne (eBook) download books from 
Project Gutenberg
A powerful foss e-book reader with Text-To-Speech (TTS) support (setup 
SherpaTTS in your phone settings)
A simpler yet awesome foss e-book reader for people that want modern design and don't need TTS
A great proprietary e-mail client for mobile.
Worth mentioning : 
Spark Mail Worse privacy policy
A great map app that isn't the best but works offline is open source and respect your geolocation data.
Community is forking to 
CoMaps
A proprietray map app with strong privacy policy.
Worth mentioning :
TomTom AmiGO Not as private at all
Waze Privacy invasive (owned by Google)
Google Maps Privacy invasive
A lightweight, modern and feature rich freemium local music player
You can get premium features for free with the fork 
Metro - A music player for Android at the cost of less consistent updates
A super lightweight local music player.
Worth mentioning :
PixelPlayer Material You Expressive
Fossify Music Player
If you don't have Spotify or Deezer here are good free options
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