Florian Effenberger recently posted statistics of the number of developers contributing to the LibreOffice project. Several months ago, Cedric Bosdonnat offered data on the number of contribution and contributors from the various sources. While Effenberger's post provides much less detail, it still provides a glimpse into the composition of the growing community.
According to commit counts it seems 54 developers from Oracle, everybody's favorite bad guy these days, has the highest employee count. This was a full 18% of all commits. As Italo Vignoli explained, "Oracle contributions are related to the OOo code that has been merged with LibreOffice, and in fact the number of commits has decreased dramatically during the last few months. There are, though, some former Oracle developers contributing on a volunteer basis to LibreOffice."
rest here