A localization data file found at docs.google.com allegedly contained references to Presently, which some have speculated is an office presentation program similar to Google Writely. Although the references have since been removed, the original version of the file was copied and is still circulating around the Internet. Google has not yet confirmed or denied the existence of Presently, but the evidence in question seems to indicate that the product is at least planned, if not under active development.
Based on the contents of the localization file, Presently appears to be a presentation application modeled after Microsoft Powerpoint with support for features like full-screen viewing and the ability to convert data between presentation and document formats. The localization file also seems to indicate that the Presently program is unsupported in Opera.