The Document Foundation has announced the release of LibreOffice 3.5.1 for Windows, Linux, and Mac (Intel or PowerPC). This is primarily a bug fix release, which addresses a number of issues in version 3.5, released last year.
You can download LibreOffice, in a variety of (human) languages here; you can also download the source code, and the development kit for extensions. (LibreOffice is distributed under the LGPL.) Further information is available in the Release Notes.