OpenOffice was owned by Sun Microsystems and transferred over to Oracle. Most of the devs working on it weren't satisified with how the two handled the project and left to form The Document Foundation, which forked it into LibreOffice.
Shortly after, Oracle killed it completely and fired the remaining staff, however IBM convinced Apache to take it over and re-release it under a more permissive license. Now, OpenOffice is basically a zombie of a project that refuses to die and hasn't seen any new feature upgrades since 2014, while LibreOffice releases ~2 feature upgrades every year.
But it's not completely dead. It does receive some bug fixes and security patches from time to time.
Shortly after, Oracle killed it completely and fired the remaining staff, however IBM convinced Apache to take it over and re-release it under a more permissive license. Now, OpenOffice is basically a zombie of a project that refuses to die and hasn't seen any new feature upgrades since 2014, while LibreOffice releases ~2 feature upgrades every year.
But it's not completely dead. It does receive some bug fixes and security patches from time to time.