Excellent free software.

Linux

• Distro: Manjaro, EndeavourOS
• Desktop: Xfce
• Firewall: gufw
• Proces viewer: btop
• Screensaver: XScreenSaver
• Terminal: Yakuake

Internet

• Browser: Vivaldi
  ↳︎ Ad blocking: uBlock Origin
  ↳︎ Convenience: Enhancer for YouTube™, LanguageTool Plus, TransOver, Web Scrobbler
• Ad blocking: hBlock
• Chat: Element [matrix]
• Cloud storage: MEGA
• Email: Vivaldi Webmail
• Password manager: bitwarden
• P2P: Soulseek, Deluge
• Remote control: KDE Connect
• RSS: RSS Guard
• Search: Kagi Search, Startpage, DuckDuckGo
• Translate: Google Translate, Deepl Translate
• YouTube: invidio.us

Utilities

• Calculator: Qalculate!, GeoGebra, WolframAlpha, Symbolab, (wxMaxima)
• Code: VSCodium
• Eye health: Redshift, (Windows: f.lux)
• Image viewer: Gwenview
• Image editing: Photopea, (Krita, Inkscape)
• Live USB bootloader: Ventoy
• Macros: Autokey, (Windows: AutoHotkey)
• Media player: smplayer, Audacious
• Spotify downloader: spotDL
• Text: LyX, LibreOffice, xed
• Video editing: shotcut, (Natron, Flowblade, LosslessCut)

Smartphone

Model: 1. Samsung S10e (second-hand), 2. OnePlus One (2014).

OS: 1. Android 12, 2. LineageOS ^(18.1) + microG (No Google account needed!).

F-Droid app catalogue:

• 2FA: Aegis Authenticator
• Chat: Element [matrix]
• Chess clock: Simple Chess Clock
• Flash cards: Anki
• Gallery: Camera Roll
• Keyboard: FlorisBoard
• Notes: Markor
• Podcast player: AntennaPod
• Remote control: KDE Connect
• YouTube: NewPipe

Smartphone

Aurora Store app catalogue:

• Ad blocking: Rethink DNS
• Browser: Kiwi Browser
  ↳︎ Ad blocking: uBlock Origin
  
• Calculator: Jade Scientific Calculator
• Calendar: Business Calendar 2 Planner
• Cloud storage: MEGA
• Dictionary (offline): Livio , Linguee
• Email: BlueMail
• Eye health: Darker
• File explorer: Cx File Explorer
• Graphing calculator: GeoGebra, Desmos
• Music player: Musicolet
• Pomodoro: Productivity Challenge Timer
• Screensaver, live wallpaper: XScreenSaver
• Scrobbler: Pano Scrobbler

apkpure website:

• Calculator: MathAlly

Miscellaneous

• Chess: lichess
• Comedy: South Park
• Library: Z-Library, Library Genesis
• Great Internet Mersenne Prime Search: GIMPS
• Science news: Quanta Magazine
• Skateboarding: Thrasher Magazine