Orb

Orb is a free app to diagnose Internet connectivity issues.  It is available for multiple platforms.

https://orb.net/ 

Asciinema

Asciinema is a free and open source solution for recording terminal sessions with Linux.

https://asciinema.org/

https://www.howtogeek.com/how-to-record-linux-terminal-with-asciinema/

PowerTree

PowerTree is a PowerShell module that is a replacement for the old tree command.

https://github.com/spaansba/PowerTree

https://petri.com/powertree-powershell-visualize-file-structure/

Bandwhich

Bandwhich is a real-time network monitor that displays live network connections within Linux.

https://github.com/imsnif/bandwhich

https://www.howtogeek.com/great-linux-utilities-to-monitor-your-system-resources-in-the-terminal/

Espanso

Espanso is a cross-platform and open-source text replacement (or text expander) tool.

https://espanso.org/

https://www.blackhillsinfosec.com/espanso-text-replacement/

Sites that offer older games within a web browser

Below are a few sites that offer older games via a web browser that require no local installation.

https://freevideogames.org/

https://www.free80sarcade.com/

https://www.retrogames.cc/