For word processing, spreadsheets, etc. on the Android, it may be worth keeping an eye on Libre Office as an Android version is being developed.

It seems to be in alpha/experimental state at the moment and is not available on Google play but if anyone wants to try and have a look at the current state and see if they can get anything to work, daily builds are available at http://dev-builds.libreoffice.org/daily/master/Android-ARM@24-Bytemark-Hosting/current/.