Dropbox an online file backup, synchronization between devices, and file sharing app. No fee, but more storage available with fee-based account. It provides up to 2Gb of storage for free and up to 100Gb for paid accounts.
Evernote allows you to create new and access saved webpages, documents, text notes, audio notes, and phone snapshots. Account registration required. A fee version is available with more storage space and features.
Instapaper App that allows you to download webpages and PDFs to a mobile device to access offline. Automatic formatting makes reading easier and removes need to scroll and pan around PDF documents on phone. A fee version is available with more features.