Internet

Traintime PDA
Another personal data assistant for XDU undergraduate.

SkyTube Legacy
An open source YouTube client for legacy devices

twitter2nitter
Redirect twitter to nitter by sharing url/text

Databag
A federated chat client designed for privacy and selfhosting.

Stealth
Stealth is an account-free, privacy-oriented, and feature-rich Reddit client.

TrackerControl
TrackerControl allows to monitor and control hidden data collection in apps.

Passy - cross-platform password manager
Offline password manager with cross-platform synchronization

Syncthing
Open, trustworthy and decentralized file synchronization

NewPipe
Lightweight YouTube frontend

Mullvad VPN: privacy is a universal right
Protect your online privacy with a fast, trustworthy, and easy-to-use VPN.

SchildiChat
Secure messenger for Matrix with a traditional instant messaging experience

AndroDNS
DNS client

Seafile
File synchronization

Toadua
The collaborative Toaq dictionary

Geekttrss
A Tiny Tiny RSS reader with transparent offline mode

Tinc App
Android binding and user interface for the tinc mesh VPN daemon

OONI Probe
Open Observatory of Network Interference (OONI)

Filester
A simple file uploader

RedReader
Client for reddit.com

Geddit
An open-source, Reddit client for Android without using their API

Element - Secure Messenger
Group messenger - encrypted messaging, group chat and video calls

Nextcloud Tables
Companion app for Nextcloud Tables

Pix-EzViewer
A third-party Pixiv Android client. (Android 5.0+)

Syncthing-Fork
Wrapper for Syncthing - Open and decentralized file synchronization

Dokuwiki Android
Access in local to your dokuwiki

AndStatus
Multiple accounts client for multiple social networks

FediPhoto-Lineage
FediPhoto-Lineage - quickly post photos to the Fediverse.

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

Candle
Real-time stock market watcher.

Based Cooking
Simple, ad free, open source recipe app.