System

AdAway

AdAway is an open source ad blocker for Android using the hosts file.

Gadgetbridge

Communicate with Pebble/Mi Band/Amazfit Bip/Hplus devices and more

FindMyDevice

Locate your smartphone via SMS when it gets lost

NC Passwords

A password manager app for Nextcloud's Passwords app

SecondScreen

Better screen mirroring

Guileless Bopomofo

A simple Bopomofo software keyboard (input method editor) for typing Hanyu

SMS Messenger

An easy and quick way of managing SMS and MMS messages without ads.

Simple Notes Pro

A beautiful quick note taking app without ads or weird permissions.

Simple File Manager Pro

A simple file manager for browsing and editing files and directories.

Screenshot Tile (NoRoot)

Quickly take screenshots from the quick settings panel

EteSync

Secure, private and end-to-end encrypted calendar, contacts and tasks sync

Easer (beta)

User-defined explicit automation for Android

TinyBit launcher

Small memory footprint, icon pack support, color and behaviour customizable

GLMark2

glmark2 is an OpenGL 2.0 and ES 2.0 benchmark.

KDE Connect

KDE Integration

UnApkm

Decrypt Apk Mirror's APKM files and save them as APKS

Settings Database Editor

Open source version of the 4A Settings Database Editor

Dialer

A handy phone call manager with phonebook, number blocking and multi-SIM support

Insular

Isolate your Big Brother apps

Material Flashlight

Flashlight with some cool features

EDL Dashboard

Companion app to EngineDataLogger ECU software.

LukeLauncher

A category based launcher

TimeLimit

Simply limit the usage duration

TimeLimit

Flexibly limit the usage duration

LaMetric Notify+

Send notifications to a LaMetric Time smart clock

Alt Launcher

Launch apps on boot and fastboot on Phoenix Android (and similar) radios

Disable Battery Warnings

Disable the annoying low battery warning popup and sound

F-Droid

The app store that respects freedom and privacy

WLANScanner

Analyse the WiFi networks in range.

Battery Tool

Automatically stop apps running in the background. Free, no ads and open source.