Core
Operating system: Xubuntu (18.04 LTS)
Package Manager: Synaptic Package Manager
Misc: Gufw firewall, QTerminal, KSysGuard, xscreensaver

Productivity
Office: LyX (2.3.2) + TeX Live or MiKTeX (Windows), LibreOffice
Programming: Atom
Graphics: GIMP

Communication & privacy
Browser: Firefox
↳︎ security: uBlock Origin, uMatrix, Violentmonkey + Anti-Adblock Killer, HTTPS Everywhere, Facebook Container
↳︎ convenience: Grammarly, Foxy Gestures, Simple Translate, Enhancer for YouTube
DNS: 1.1.1.1 (Cloudflare, APNIC)
Email: ProtonMail
Chat: Telegram
IRC: Quassel IRC

Utilities
Cloud storage: MEGA
Macros: Autokey, AutoHotkey (Windows)
Screenshots: imgur-screenshot, ShareX (Windows)
Media player: VLC
Calculator: SpeedCrunch
Eye health: Redshift, f.lux (Windows)
Torrent: Transmission
Corsair mouse driver: ckb-next
Money: Bitcoin (full node)

Games
lichess, Chess Tempo, Cave Story