Spreadsheet and spreadsheet+database like applications that can be use for building applications, analytics tools, forms etc. Famous commerical apps are - airtable.
Grist | The Evolution of Spreadsheets
Budibase | Build internal tools in minutes, the easy way
Baserow: Open source no-code database and Airtable alternative
ToolJet | Open-source low-code platform to build internal tools
See also internal-tools