FOP (Formatting Objects Processor) is an XSL-FO processor written in Java programming language, which provides the feature to convert XSL-FO files to portable document format or direct-printable-files. FOP was originally developed by James Tauber who donated it to the Apache Software Foundation in 1999. It is part of the Apache XML project.

FOP is open source software, and is distributed under the Apache Software License.

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