Collection of Free and Open Source Android apps

• App Stores
• Communication
  • SMS
  • E-Mail
  • Instant Messaging
• Files
  • Backups
  • File manager
  • File Sync
  • Storage Tools
• Finance
• Navigation
  • Maps
  • Public transportation
• Media
  • Audio-/Videoplayer
  • Audiobooks
  • Camera
  • Games
  • Podcasts
  • YouTube
• Networking
  • Torrenting
  • VPN
• News
  • RSS
• Notes
• Organizing
  • Calendar
    • Offline
    • Online
  • Notes
  • Tasks
• PDF
• Privacy
• Security
  • Cryptography
  • Password management
  • Two-Factor Auth.
• Social networks
  • Reddit
• Tools
  • Keyboard
  • Translation
• Weather
• Web Browsing
• Credits

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App Stores

• F-Droid - App store that only includes FOSS apps. Custom repositories can be added.
• Yalp Store - Downloads .apk files directly from Google Play. (F-Droid, Source Code)

Communication

SMS

• QKSMS - SMS client with advanced features. (F-Droid, Source Code])
• Silence - Fork of Signal, provides End-to-End encryption for SMS. (F-Droid, Source Code)

E-Mail

• K-9 Mail - Advanced E-Mail Client. Supports PGP with OpenKeychain. (F-Droid, Source Code)

Instant Messaging

• Conversations - XMPP client with built-in OMEMO, OTR and OpenPGP support. (F-Droid, Source Code)
• Riot - Messenger using the Matrix protocol. (F-Droid, Source Code)
• Signal - End-to-End encrypted messenger, needs phone number. (non-free APK, Source Code)
• Telegram - Messenger, needs phone number. (F-Droid, Source Code)
• Wire - End-to-End encrypted messenger, doesn't need a phone number. (non-free APK, Source Code)

Files

Backups

• oandbackup - Can backup and restore apps. Backups can be encrypted with PGP. Needs root. (F-Droid, Source Code)

File manager

• Amaze - Material design based file manager. - (F-Droid, Source Code)
• Ghost Commander - Dual panel file manager, allows for plugins for SMB and FTP (F-Droid, Source Code)

File Sync

• Syncthing - P2P file synchronization. (F-Droid, Source Code)

Storage Tools

• DiskUsage - Shows storage usage. (F-Droid, Source Code)
• SD Scanner - Rescan the storage for new media. (F-Droid, Source Code)

Finance

• Bitcoin Wallet - Bitcoin Wallet. (F-Droid, Source Code)
• My Expenses - Finance manager. (F-Droid, Source Code)

Media

• DroidShows - Browse and track TV shows. (F-Droid, Source Code)
• Metronome - Metronome app. (F-Droid, Source Code)

Audio-/Videoplayer

• Vanilla Music - Material Design music player, addons available. (F-Droid, Source Code)
• VLC - VLC media player. (Available in the F-Droid archive, APK, Source Code)

Audiobooks

• Material Player - Material design based audio book player. (F-Droid, Source Code)

Camera

• Open Camera - Camera app, provides a lot of settings. (F-Droid, Source Code)

Games

• Anuto TD - Tower defense game. (F-Droid, Source Code)
• Minetest - Minecraft like game, supports mods and can connect to servers. (F-Droid, Source Code)
• Simple Solitaire Collection - Solitaire game collection with 14 games (F-Droid, Source Code)

Podcasts

• AntennaPod - Advanced Podcast player. (F-Droid, Source Code)

YouTube

• NewPipe - YouTube frontend. (F-Droid, Source Code)
• Feeder - RSS reader - works good with NewPipe, can import .opml files. (F-Droid, Source Code)

Navigation

Maps

• OsmAnd~ - OpenStreetMap client. (F-Droid, Source Code)

Public transportation

• Transportr - Public transport app. (F-Droid, Source Code)

Networking

• Net Monitor - Shows what apps currently have an internet connection. (F-Droid, Source Code)

Torrenting

• LibreTorrent - Torrent client. (F-Droid, Source Code)

VPN

• OpenVPN - OpenVPN client for android. (F-Droid, Source Code)

News

• LibreNews - Breaking news notification app. (F-Droid, Source Code)

RSS

• spaRSS - Feed reader. (F-Droid, Source Code)

Notes

Organizing

Calendar

Offline

• Offline Calendar - Calendar app, completely offline. (F-Droid, Source Code)

Online

• Etar - material design based calendar, uses Android Calendar sync. (F-Droid, Source Code)

Notes

• SealNote - Notepad that provides encryption. (F-Droid, Source Code)
• Swiftnotes - Simple notepad. (F-Droid, Source Code)

Tasks

• OpenTasks - Tasks can be synchronized using DAVDroid. (F-Droid, Source Code)

PDF

• Document Viewer - Supports multiple document formats. (F-Droid, Source Code)
• MuPDF - Small PDF viewer. (F-Droid, Source Code)
• MuPDF mini - Even smaller PDF viewer. (F-Droid, Source Code)
• PDF Creator - Create and edit PDF files. (F-Droid, Source Code)

Privacy

• Wi-Fi Privacy Police - Prevents sending of known Wi-Fi networks. (F-Droid, Source Code)

Security

Cryptography

• OpenKeychain - Provides OpenPGP security. (F-Droid, Source Code)

Password management

• KeePass2Android - Advanced implementation of the KeePass standard on Android. (APK, Source Code)

Two-Factor Auth.

• andOTP - Provides TOTP, can backup and restore keys encrypted (PGP or Password). (F-Droid, Source Code)
• FreeOTP - Provides HOTP and TOTP. (F-Droid, Source Code)

Social networks

• AndStatus - Low traffic social network client. (F-Droid, Source Code)
• dandelion* - Client for dandelion*. (F-Droid, Source Code)
• Twidere - Microblogging / twitter.com client. (F-Droid, Source Code)

Reddit

• RedReader - Easy-to-use reddit frontend. (F-Droid, Source Code)
• Slide - Advanced app for reddit. (F-Droid, Source Code)

Tools

• Termux - Terminal emulator, addons available. (F-Droid, Source Code)
• SatStat - Read device sensors. (F-Droid, Source Code)

Keyboard

• AnySoftKeyboard - Keyboard with many customization options. (F-Droid, Source Code)

Translation

• QuickDic - Offline translation dictionary. (F-Droid, Source Code)

Weather

• Weather - Provides interface for several weather websites. (F-Droid, Source Code)

Web Browsing

• Fennec F-Droid - Rebranded version of Firefox for F-Droid. (F-Droid, Source Code)
• Firefox Klar - Private Mode browser, clear browser data with one tap. (F-Droid, Source Code)
• GApps Browser - Provides WebView for Google Websites. (F-Droid, Source Code)
• Wikipedia - Official Wikipedia Android app. (F-Droid, Source Code)

Credits

Inspired by other awesome lists.