PostGIS - Open source spatial database
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
H2GIS - A spatial extension of the H2 database. Compliant, Solid, Tested.
Knack - Knack is the easiest, most spectacular business management software available.
QGIS - QGIS is a desktop geographic information system, or GIS.
Zoho Creator - Zoho Creator is a low-code application development platform that helps you build a custom, mobile-ready apps to run your business.