I basically have PDFs which I want to compress using Adobe preset settings (details here). I want a tool which can apply the "Rich content PDF" (previously known as "ebook") preset settings on an existing PDF. Ghostscript supports this (can be seen here).
As Ghostscript requires a license for commercial applications and is costly, I'm looking for alternatives for the same with a preference for open-source software.
Any help will be really appreciated!