You mean between Apache OpenOffice and LibreOffice? Because Openoffice.org is dead, and it had several children. The collaboration is limited on practical terms because of the licensing differences, but we are rebasing our code on the latest Apache OpenOffice in order to be able to have a cleaner licensed base. Right now, we must still deal with the LGPL v3, and while it’s a great licence it cannot change over time; so we have embarked in a relicensing effort towards MPL v2 and GPL v3+ and we are looking forward the interesting switch at Apache OpenOffice from the Openoffice.org codebase to the Symphony codebase; there will certainly be some code we might be able to reuse. Although, when you come to think of it, it’s funny to enter the Apache Incubation Process with one software you’re inheriting, and to use a different software you’ve also inherited just after the incubation process is completed 🙂