Where could I download OpenOffice tool service files for free?
After some research I found website which provides you with extensions for your OpenOffice which enables you to extends capabilities of your OpenOffice. It contains lots of writing tools. Although OpenOfice is not updated for a 3 years those extensions are still operational and you can get them from this link: https://code.google.com/archive/p/writertools/downloads
I hope I helped you.