Web Browser: Firefox Email Client: Thunderbird File manager: Nemo Basic Text Editor: Geany Messaging Client: Telegram, Pidgin IRC client: Hexchat PDF Reader: Evince Calendar: Thunderbird's built-in Video Player: VLC Music Player: Spotify non-free, VLC Screen recording: SSR (ppa:maarten-baert/simplescreenrecorder) System monitor: htop, gnome-system-monitor Calculator: apcalc