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Apache FOP vs Antenna House Formatter: catalog facts
Apache FOP	Antenna House Formatter
Free Free and open source from the Apache Software Foundation.	Paid Commercial licences with paid maintenance; a trial download is available.
Windows, macOS, Linux, Command line	Linux
Supports PDF/A, PDF/X and PDF encryption Runs from the command line or embedded in Java	Supports both XSL-FO and CSS for Paged Media Long development history with regular releases
Requires writing XSL-FO stylesheets Needs a Java runtime	Paid commercial licence Aimed at automated publishing rather than editing existing PDFs
Downloadable app	Downloadable app
Open source	Closed source
License: Apache-2.0	License: Proprietary
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.