Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Zoho Creator - Zoho Creator is a low-code application development platform that helps you build a custom, mobile-ready apps to run your business.
Knack - Knack is the easiest, most spectacular business management software available.
Ragic - World's most advanced online database engine. Build powerful online databases with simple Excel style online interface.
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Microsoft PowerApps - Microsoft PowerApps provides tools to create, customize, share and run apps.