[DMcCunney]

I prefer open source applications, with freeware if there isn't a good open source application for the purpose. Freeware tends to be ad supported, with payware versions that remove the ads. In a few instance, I bought them.

Names in bold require a rooted device to work at all. Names in italic can use root for some functions, but don't require it to work for non-root activities.

Note that while there are Google Play URLs given below, most open source offerings actually came from the F-Droid repository at http://f-droid.org using the F-Droid client below, and the Google Play URL may not be a valid link. (And some things are available from both services, but have different digital signatures, so you can't update an app from Google Play with a newer version from F-Droid or vice versa. The update must come from the same source as the original.)

Questions and comments are welcome, but this is a work in progress and I may not know the answers for some things listed here.

Launcher
Nova Launcher https://play.google.com/store/apps/d...oilsw.launcher
Nova Launcher Prime https://play.google.com/store/apps/d...launcher.prime

The launcher is what you see when you power on your device. Android has a default launcher app, but vendors tend to offer custom launchers bundled with their products, and there are a variety of third-party launcher intended as replacements for what came with the device.

My choice is Nova Launcher, which mains the stock AOSP launcher look and feel, but adds more power and configurability. The free version is full featured and quite usable. The Prime payware addon unlocks additional gesture support not in the free offering.

Applications
920 Text Editor https://play.google.com/store/apps/d...lyin.editor.v2
Open source syntax highlighting text editor. (This one is v2 from Google Play. v1 is no longer on Google Play, but is still listed in F-Droid, which will not get v2 for licensing reasons.)

A Photo Manager https://play.google.com/store/apps/d...ndroFotoFinder
Open source images manager, similar to Gallery

AndrOpen Office https://play.google.com/store/apps/d...andropenoffice
Font Pack for AndrOpen Office https://play.google.com/store/apps/d...tensions.fonts
Android port of the Open Office productivity suite, and an add-on font pack for it.

AOO is a work in progress, not fully optimized for smaller touch screens. It's big, requiring 300MB of app storage, and requires tweaking for effective display on smaller screens. (I turned off the various iconified toolbars leaving only a menu interface.) It also really needs an external hardware keyboard and possibly a mouse.)

Barcode Scanner https://play.google.com/store/apps/d...client.android
Open source barcode scanner using device camera

Effects Pro https://play.google.com/store/apps/d...appsroid.fxpro
Open source image effects editor, useful for post-processing images from the camera.

FBReader Premium https://play.google.com/store/apps/d...d=com.fbreader
Open source viewer for eBooks in ePub, FB2, Mobi and other formats (no DRM) native, and other formats via plugins.

The premium payware version I use build in a PDF viewer plugin and bookshelf support. Those are separate plugins in the free version. There are also plugins for viewing DjVu and CBR/CBZ files from FBReader

Focal https://play.google.com/store/apps/d...fr.xplod.focal
Open source camera app, and alternative to the bundled Camera app on device

MuPDF https://play.google.com/store/apps/d...ifex.mupdfdemo
Open source PDF viewer, and alternative to the official Adobe PDF view app.

New York Maps https://play.google.com/store/apps/d...ewyorky.metroy
NYC Subway maps usable offline. Likely not useful if you don't live in NYC and take the subway.

Photos https://play.google.com/store/apps/d...id.apps.photos
The Google Photos app. The one bundled on device was part of an older Google+ offering and is no longer available. This on is stand alone.

Open Camera https://play.google.com/store/apps/d...rge.opencamera
Open source camera app, and alternative to the bundled Camera app on device

VLC https://play.google.com/store/apps/d...g.videolan.vlc
Android port of the open source, cross platform media player. I run VLC under Windows and Linux on the desktop-, and was happy to get it for Android.

WPS Office + PDF https://play.google.com/store/apps/d...ps.moffice_eng
The best of the freeware Android office suites, capable of viewing, editing and creating Word and Excel files and viewing PDFs. It can also connect with online services like Dropbox and Google Drive where such files might be stored, and download local copies for offline work. The bundled Kingsoft Office of on the tablet is an earlier version.

ZooBorns https://play.google.com/store/apps/d...eanie.zooborns
Client to display new pictures from the Zooborns baby zoo animals site

Games
Android's Fortune https://play.google.com/store/apps/d...ndroidsfortune
Android version of Unix fortune

Checkers https://play.google.com/store/apps/d...droid.checkers
Open source Checkers game

DroidFish https://play.google.com/store/apps/d...tero.droidfish
Open source Chess game using Stockfish engine

Magic DosBox Free https://play.google.com/store/apps/d....magicbox.free
Android port of open source, cross platform DOSBox app, for running MSDOS games on other platforms. (I use it to run character mode DOS apps, not games.)

Mahjongg Builder https://play.google.com/store/apps/d...droid.mahjongg
Open source Mahjongg game with select-able layouts

n-Puzzle https://play.google.com/store/apps/d...puzzle.android
Open source 15 puzzle game

NetHack https://play.google.com/store/apps/d...=com.nethackff
NetHack Tiles Pack https://play.google.com/store/apps/d...ff_tiles_pack1
Android port of classic open source Unix Nethack game, with tiles pack

Reversi https://play.google.com/store/apps/d...ndroid.reversi
Open source Reversi game

robotfindskitten https://play.google.com/store/apps/d...botfindskitten
Android port of open source, cross platform Robot Finds Kitten Game.

Roguelike Classics https://play.google.com/store/apps/d...droid.classics
Android versions of various "rogue-like" Unix games, including Larn, Rogue, and Moria

Solitaire https://play.google.com/store/apps/d...agic.solitaire
Open source Solitare game, with Solitaere, Forty Thieves, Freecell, and Spider versions

Utilities
Amaze https://play.google.com/store/apps/d...ze.filemanager
Open source file manager with Material design

AndSys ~ Apps https://play.google.com/store/apps/d...ceforge.andsys
Open source Android applications lister

App Dragon 2.0 https://play.google.com/store/apps/d...nkey.appdragon

App Drawer https://play.google.com/store/apps/d...soft.appdrawer
AppDrawer https://play.google.com/store/apps/d...edUp.AppDrawer
Two different alternate applications drawers for viewing installed apps and adding them to screens on device.

[b]Autostarts[/i] https://play.google.com/store/apps/d...oid.autostarts
Open source control for what is started automatically on Android

Bash X https://play.google.com/store/apps/d...bash.installer
Open source Android port of Gnu bash shell

BatteryBot Pro https://play.google.com/store/apps/d...ryIndicatorPro
Open source battery monitoring app with history of usage by app

Bodha Converter https://play.google.com/store/apps/d...ties.converter
Open source binary/hexadecimal/octal/decimal unit converter.

BRexx https://play.google.com/store/apps/d....marmita.brexx
Android port of Rexx script language. Requires Android Scripting Layer

build.prop Editor https://play.google.com/store/apps/d...ld.prop.editor
Android build.prop file editor

BusyBox https://play.google.com/store/apps/d...meefik.busybox
Full Android version of Busybox Linux commands collectio

CatLog https://play.google.com/store/apps/d...nlawson.logcat
Open source Android log file viewer

Clip Stack https://play.google.com/store/apps/d...ipboardmanager
Open source Android clipboard manager

DNS Hostname Changer https://play.google.com/store/apps/d...id.dns.changer
Change the name reported by your device to networks

DroidEdit https://play.google.com/store/apps/d....droidedit.pro
Freeware syntax highlighting text editor with payware no-ads version I use.

DroidGrep https://play.google.com/store/apps/d....aor.droidgrep
Freeware GUI version of Unix grep utility from DroidEdit author

F-Droid https://play.google.com/store/apps/d....fdroid.fdroid
Open source client for accessing F-Droid open source Android app repository

Hacker's Keyboard https://play.google.com/store/apps/d...ion.pckeyboard
Open source replacement for standard Google keyboard with additional features

Hangar https://play.google.com/store/apps/d...imic.apphangar
Open source app listing most recently used apps as icons in notification bar

Hosts Editor https://play.google.com/store/apps/d...em.hostseditor
Open source editor the device Hosts file

Inbox https://play.google.com/store/apps/d...oid.apps.inbox
Google Inbox add-on for Gmail

Keep https://play.google.com/store/apps/d...e.android.keep
Google note taker

Kingo Link https://play.google.com/store/apps/d....kingoapp.link
Kingo app providing connectivity with desktop

[b]Link2SD[/i] https://play.google.com/store/apps/d...m.buak.Link2SD
Link2SD Plus (New) https://play.google.com/store/apps/d...ak.link2sdplus
Freeware app to allow storage of applications on external card. (The card must be partitioned with part set up with a Linux file system. Link2SD can move apps from device memory to that part of the card, and set up a symlink to them in the root filesystem. Setting up the symlink in the root file system requires a rooted device.)

Manpages https://play.google.com/store/apps/d...hmod0.manpages
Freeware collection of Linux man pages with GUI Android viewer. Man pages can be downloaded to local storage.

My App List https://play.google.com/store/apps/d...myapplist.open
Another open source application lister. This one can save the list to the clipboard or a file, and is how I generated this list.

OI About https://play.google.com/store/apps/d...nintents.about
Open source Open Intents project add-on for displaying information about cooperating apps.

Omnidroid https://play.google.com/store/apps/d....omnidroid.app
Open source Android automation app to set up automated responses to various events.

Open Manager https://play.google.com/store/apps/d....nexes.manager
Open source device viewer and file lister.

Organized Drawer https://play.google.com/store/apps/d...enbrain.drawer
Open source app drawer viewer which lets you assign apps to categories for viewing

OS Monitor https://play.google.com/store/apps/d...wral.osmonitor
Open source process lister similar to Linux top command

Paragon NTFS & HFS+ https://play.google.com/store/apps/d...aragon.mounter
Driver adding support for NTFS and HFS+ file systems
(Used here occasionally to support an external USB backup drive formatted as NTFS)

PerApp https://play.google.com/store/apps/d...entauri.PerApp
Open source app to specify starting orientation of app by application
(I always want certain things to open in landscape mode. This does that.)

Preferences Manager https://play.google.com/store/apps/d...erencesmanager

QuickEdit Pro https://play.google.com/store/apps/d...msoft.edit.pro

SL4A https://play.google.com/store/apps/d...roid_scripting
Open source Android scripting layer

Solid Explorer https://play.google.com/store/apps/d...solidexplorer2
Solid Explorer Unlocker https://play.google.com/store/apps/d...lorer.unlocker
Dual pane file manager with Material design, and payware unlocker to remove ads

Storage & USB https://play.google.com/store/apps/d...co.filemanager
Open source widget to provide direct access to Storage and USB section of Settings

SuperSU https://play.google.com/store/apps/d...infire.supersu
Kingo Root root request broker

System App Safe Remover https://play.google.com/store/apps/d...ager.systemapp
Utility for removing system apps on rooted devices.

Terminal Emulator https://play.google.com/store/apps/d...al.androidterm
Android console terminal emulator, similar to Xterm, to open a command line on device

Text Utilities https://play.google.com/store/apps/d....textutilities
TextTools https://play.google.com/store/apps/d...afia.TextTools
Two freeware utilities providing an assortment of text manipulation functions, like changing case of lines.

Timber https://play.google.com/store/apps/d...naman14.timber
Open source music player for local content with Material design

Turbo Client https://play.google.com/store/apps/d...d=turbo.client
Open source FTP client for Android by TurboEditor author

Turbo Editor https://play.google.com/store/apps/d...kyn.fileeditor
Open source multi-file syntax highlighting editor

Unix Time https://play.google.com/store/apps/d...softs.unixtime
Display current Unix epoch (sine January 1st, 1970) time

VimTouch https://play.google.com/store/apps/d...o.app.vimtouch
VimTouch Full Runtime https://play.google.com/store/apps/d...ch.fullruntime
Android port of open source Vim editor optimized for touch screen use, and full runtime for use of Vim in a console.

VX ConnectBot https://play.google.com/store/apps/d....vx.connectbot
Open source SSH client for Android

Wifi Analyzer https://play.google.com/store/apps/d....wifi.analyzer
Wifi network analyzer displaying nearby networks and signal strengths

Wifi Widget https://play.google.com/store/apps/d...ang.wifiwidget
Widget to toggle Wifi on/off
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Dennis