I use InstallFree Nexus and Rndr on my Chromebook and in Chrome to LibreOffice and Java on any device, including my Chromebook.
They have another great extension for Chrome, Attachment Viewer for Gmail, which lets you view, edit, save and share attachments in Gmail. You can work with Office and other document formats directly from Gmail, on any device running Chrome, including Chromebooks, Chromeboxes, Linux, Mac and PCs. This means you can work on them directly in your browser without any installs or downloads on your device.
This is a great resource for Chromebooks and shared computers and is very useful in educational settings where you don't want files downloaded or shared computers are being used.
Get it in the Google Chrome Web Store or go to InstallFree's website for more information.