LibreOffice - Base
Open Source
Base is a full-featured desktop database front end, designed to meet the needs of a broad array of users.
Airtable
Freemium
Airtable is a spreadsheet-database hybrid i.e., the features of a database are applied to a spreadsheet.
VFront
Open Source
VFront is a dynamic front-end for MySQL or PostgreSQL databases written in PHP and Javascript.
H2 Database Engine
Open Source
H2 Database Engine is a relational database management system written in Java.
Compare FileMaker Pro with alternatives
Compare LibreOffice - Base and FileMaker Pro and decide which is most suitable for you.
Compare VFront and FileMaker Pro and decide which is most suitable for you.
Compare Airtable and FileMaker Pro and decide which is most suitable for you.
Compare H2 Database Engine and FileMaker Pro and decide which is most suitable for you.