The NeoOffice project is no longer active
As a replacement, you may want to try LibreOffice

NeoOffice is an office suite for macOS that is based on old versions of OpenOffice and LibreOffice. With NeoOffice, you can view, edit, and save older OpenOffice and LibreOffice documents.

Note: if you need to view, edit, and save newer LibreOffice or Microsoft Office documents, you may want to try LibreOffice. In most cases, the latest version of LibreOffice can open and save Microsoft Office documents far better than NeoOffice.

Build NeoOffice

Instructions for building NeoOffice are in the BUILD.txt file.

Download NeoOffice

NeoOffice version	macOS and OS X versions	Notes
Current versions:
Download from either of the following sites: NeoOffice Professional Edition NeoOffice in the Mac App Store	macOS Sonoma macOS Ventura macOS Monterey macOS Big Sur
Older versions:
NeoOffice 2017.33 Professional Edition	macOS Monterey macOS Big Sur macOS Catalina macOS Mojave macOS High Sierra macOS Sierra
NeoOffice 2015.12 Classic Edition	macOS Sierra OS X El Capitan OS X Yosemite OS X Mavericks OS X Mountain Lion
NeoOffice 3.4.1 + Patch 28	OS X Yosemite OS X Mavericks OS X Mountain Lion OS X Lion OS X Snow Leopard