Apache OpenOffice 4 vs. LibreOffice 4.1
Once, whenever you referred to the free productivity suite that competes with Microsoft Office, people knew exactly which program you were talking about. Lately, though, OpenOffice -- formerly of Sun/Oracle, now under the aegis of the Apache Foundation -- has taken a backseat to LibreOffice, an upstart spun off from OpenOffice's own source code. While the two share a common code base and similar missions, they differ in their feature sets and the licensing for their source code.
For some time, LibreOffice seemed to have taken the crown from OpenOffice. Libre had commandeered a sizable portion of the OpenOffice developer base, introduced a faster revision cycle, and attracted a large number of users, thanks in part to LibreOffice now being the default productivity suite for many Linux distributions.