Hardinfo is in the Ubuntu repository, so you can enter into terminal
sudo apt-get install hardinfo
Balena Etcher comes as an AppImage which is in a Zip file. But it also has a repository you can use. Add the repo:
echo "deb https://deb.etcher.io stable etcher" | sudo tee /etc/apt/sources.list.d/balena-etcher.list
Then add the key:
sudo apt-key adv --keyserver hkps://keyserver.ubuntu.com:443 --recv-keys 379CE192D401AB61
This way, you can remove and reinstall if needed without having to do the whole process of the appimage or compressed files all over again.
Now install:
sudo apt install balena-etcher-electron