LibreOffice vs OpenOffice
LibreOffice is a fork of OpenOffice which includes the patches from the Go-OO project.
OpenOffice was previously developed by Sun Microsystems in collaboration with a community of open source developers. Oracle Corporation purchased Sun and took over Sun's role in the project. Because of evanescent support from oracle and lacking willingness to cooperate, the document foundation was established and LibreOffice was forked in late 2010. Then, after community support for OpenOffice had largely disappeared in favor of LibreOffice, Oracle donated the name and what was left of the OpenOffice project to the Apache foundation in July 2011.
LibreOffice and its parent organization, The Document Foundation, are a collaboration of Canonical (the Ubuntu company), Red Hat, Novell, and Google.
All of the companies involved in the project have a substantial connection to open source software.
 Development Effort
Large part of the know former OpenOffice Community established the document foundation, finally as official organization in 2012. Soon after the fork, the webpresence was established and in the last 18 month, there where three major releases of libreoffice(3.3, 3.4, 3.5). Further the subprojects template-center and extension-center were initiated for developing and sharing extensions and templates for LibreOffice.
Openoffice at the current status has migrated its web presence, created mailing lists. The project is currently in incubator-state as apache project, meaning that the team assures that the development is accomplished according to the apache project guidelines. OpenOffice.org announced that there will be a new release of OpenOffice (3.4) in first quarter of 2012.
LibreOffice got into development very fast and is working very productively so far. LibreOffice also seems to have gathered far more manpower than OpenOffice.org and thus is producing more results in form of software development. OpenOffice.org is still in the state of getting the required development guidelines met and seems not yet productive. Major Linux-Distributors have switched to LibreOffice as default office application.