On June 1, 2012, PortableApps.com and The Document Foundation announced the release of LibreOffice Portable 3.5.4.
LibreOffice Portable is a full-featured office suite — including a word processor, spreadsheet, presentation tool, drawing package and database — packaged as a portable app, so you can take all your documents and office suite wherever you go. This release updates LibreOffice to the latest version and contains a number of new enhancements including improved unused language removal (no longer experimental) and fixes for several issue. And it installs in as little as 250MB.
Download the Portable Apps platform from this page.