I have picked a list of free software that we can discuss: when you might want to use them, pros and cons etc:

• Libra Office - Alternative to Microsoft office , Open source
• KeePass - Password database. Open Source
• Element - Matrix (Alternative to WhatsApp) , Open Source , Runs on Windows and phones
• Gimp (Image editor) - Open source
• Open camera (Android) - Open Source
• OpenWRT (router software) - Open source
• mysql, MariaDB - Database sofware
• List may well be extended

The above software was discussed as an alternative to packages. We also mentioned Mozilla Thunderbird client as an alternative to Microsoft Outlook.