Not sure about the rest of those, but Obsidian isn’t OS either.

All of these list are great as we discover new apps each time.

But, I would suggest to write what is the app about.

I use KDE Connect as a media remote and to transfer files between my phone and computers. It has quite a few other functions, like remote mouse control, sms, seems to share clipboards as well.

https://kdeconnect.kde.org/

FOSS app which I use -

• Jerboa: Lemmy Client
• Megalodon: Mastodon Client
• RiMusic: YT Music Client
• Drodify: Material You F-Droid Alternative
• Libretube: YouTube Client
• FluffyChat: Matrix Client
• Monocles Chat: XMPP Client
• KISS Launcher: Fast and Clean App Launcher
• Cherrygram: Telegram Client
• Revolution IRC: IRC Client
• SD Maid SE: System Storage and app cache cleaner.
• SuperFreeze: Help in Force Stoping the app
• Next Player: Material You Video Player
• Diohub: Github Client
• Gitnex: Codeberg(ForjeGo/Gitea) Client
• Native Alpha: Webapp Manager - Help in creatimg Webapp
• APK Kit: APK Exporter + Give detail of Everyapp
• Material Files: File Manager
• Kiwi Browser: A better Chromium browser which Chrome Extension and Inspect Element Features AKA Dev Tools.
• Fossify Gallery: Gallery App
• Atomic: A Periodic Table App
• OpenCalc: Material You Calculator
• Proton Mail: proton.me only support its own client :(
• Psiphon: Open Source VPN(Only Client)
• Arcticons: A Line Icon Pack
• MJ PDF: A PDF viewer.
• Simple Keyboard: Best Minimal Keyboard.
• Mauth: A 2FA app
• DNS quick Tile: Add a system DNS quick to turn on or off from notification bar.
• also de-googled my device

Closed Source app which I use :( -

1.Modded

• Whatsapp Beta Mod - Privacy Features (Use because of School)
• MyInsta: Modded Instagram (Use because of friends)
• Duolingo: Removed Ads and Tracker(Use because that Green Owl have My family)
• Mimo: A code learning app - Removed Tracker and Ads (Use for fun)

2. Non-Modded

• Mobilisim: Where I got my All Mods
• ApkTool M: Android Apk Editor (Installed it when I really need it like changing package name of an app or removing a alarming permission from an app) - Give me suggestion for this app if you know

Suggestion For OP

OP You should use Florisboard beta it’s good and also Obsidian is not open source.

Obsidian isn’t FOSS

Anyone uses InnerTune?

• Moshidon: letting me communicate with people on Mastodon
• QKSMS: text message (SMS) app
• KISS Launcher: a very neat launcher that took a while before I could love it as I do now
• FairEmail: an email client with tons of options
• Mull: a fork of Firefox
• Privacy Browser: a browser based on WebView
• Simple Calendar Pro: for managing my self-hosted CalDAV (waiting for Fossify’s version)
• Fossify Gallery: managing my images and videos
• AntennaPod: listening to podcasts
• Bitwarden: managing my self-hosted vaultwarden
• Download Navi: download files instead of using the browser
• Foxy Droid: making browsing apps on mainly F-Droid and IzzyOnDroid like old-school Google Play Store
• Loop Habits: logging my habits
• Hypatia: protecting my smartphone from malware using ClamAV
• Lemuroid: able to play my childhood favourite games wherever I am
• Miniflutt: read RSS posts through my self-hosted Miniflux server
• Mullvad VPN: protecting my identity wherever I am
• OpenTracks: track my movements
• Seal: download videos from mainly YouTube, but also converting YouTube videos to MP3 files (perfect for downloading music mixes for my bicycle trips)
• Syncthing: syncing important files to and from my desktop
• Voyager: browsing Lemmy
• URL Radio: listening to manually added radio stations
• Tasks: reminding me to do stuff
• Unexpected Keyboard: by far the best keyboard with really good shortcuts
• Planisphere: exploring the sky and letting me plan my astro photography
• LibreTube: exploring YouTube through Piped API
• Simple Voice Recorder: letting me record stuff when I don’t have my audio recorder with me (waiting for Fossify’s version)

Obtainium is great for updating apps hosted outside the playstore, big upside being you don’t need to bother with FDroid releases

I use a few apps from the SimpleMobileTools suite. They aren’t full FOSS, they have basic and pro versions where the basic version is GPL3 and the proprietary extended features cost a few bucks. The basic FOSS tools are still decent, if barebones.

The suite includes:

• a calculator
• a phone dialer
• a music player
• a calendar
• a photo gallery (with basic editor)
• an audio recorder
• a flashlight
• a clock
• an app launcher
• an SMS messenger
• a camera
• a keyboard
• a note taker
• a file manager
• a contact book
• a simple painting canvas

I use the gallery and file manager the most. Though admittedly I threw a couple bucks their way for the proprietary extensions. It’s not FOSS, but if it was going to be proprietary, I think it’s one of the fairest deals in software these days. Better than another bloody subscription model, or holding the ad-free experience hostage behind a paywall.