Boomaga (BOOklet MAnager) is a virtual printer for viewing a document
before printing it out using the physical printer.
Select the "Boomaga" printer in any program and the Boomaga window
opens in several seconds (CUPS takes some time to respond).
If you print out one more document, it gets added to the previous one,
and you can also print them out as one.
Regardless of whether your printer supports duplex printing or not, you
would be able to easily print on both sides of the sheet.
GPL-2.0-only AND LGPL-2.1-or-later