Hi
http://www.linuxjournal.com/content/who-contributes-most-libreoffice
"Bosdonnat began tracking line contributions in the middle of September 2010 with the original 14 contributions being made by Oracle. Oracle actually contributes code to OpenOffice.org, and then LibreOffice merges those changes, thus resulting in Oracle's contributions to the new fork. These 112 contributions have continued throughout development, but are dwarfed by the contributions of new developers."
" These contributions make up well over half of the total new changes found in LibreOffice as of mid-February. Weekly contributions in this area have averaged between 20 and 30 with a total number of 517 line contributions."
"Red Hat, who also contributed to OpenOffice.org, has chipped in as well. With usually two contributions per week, Red Hat developers have provided 39 patches since the fork."
Rahul