Over 300 contributors having made more than 23,000 commits, with the addition, deletion or modification of around five million lines of code". SUSE and Oracle have each provided approximately 25% of the total commits. New individual volunteers accounted for another 25%, while 20% came from RedHat; the remaining contributions came from Canonical and other companies.
Please note: This release is bit-for-bit identical to the 3.4.2 Release Candidate 3, so you don't need to download or reinstall if you have that version already.
Source Libre Office