LibreOffice vs OpenOffice. LibreOffice is, IIRC, under the MPL2, and can take improvements from the Apache-licensed OpenOffice (and has done so in the past, tho

LibreOffice vs OpenOffice. LibreOffice is, IIRC, under the MPL2, and can take improvements from the Apache-licensed OpenOffice (and has done so in the past, though Apache OpenOffice has been moribound for its entire existence so there's not much to take from there anymore), but Apache OpenOffice can't take improvements from LibreOffice.