Polaris Office is a handy office suite, made up of a text editor, spreadsheet and program for creating and displaying presentations. The package copes well with Office, Google Docs, text files and PDF files.
The package is available for free and integrates with various services like box, OneDrive, Dropbox, Goole disk and others. Once you open the document, you can edit it freely or just circle and add comments. Files can be synchronized with the cloud automatically, they can be shared with other users, and even work in a group, although the tools for this are not extensive.