OpenOffice (which descended from Sun’s StarOffice) has existed as an open source project for more than a decade. Concerns about OpenOffice’s future after the Oracle/Sun merger led a core group of OpenOffice contributors to create LibreOffice, which is based on the same original code base but is getting more frequent updates than OpenOffice.
Oracle no longer controls OpenOffice, but the makers of the two office suites aren’t working together. Oracle transferred control of OpenOffice to the Apache Software Foundation, while LibreOffice is maintained by the newly created Document Foundation.