[dleeftink]

An oldy but goody for layout extraction is Cermine by Dominika Tkaczyk and colleagues[0]. Java required.

[0]: http://cermine.ceon.pl/about.html

[mdaniel]

Also AGPLv3 https://github.com/CeON/CERMINE/blob/cermine-parent-1.13/LIC...

[nhirschfeld]

didnt know this!