iWork has been a traditional software suite ever since it first launched (the brief availability of iWork.com notwithstanding), but Apple is bringing it to the web in earnest today by revealing iWork for iCloud. The suite includes Keynote, Numbers and Pages, and each of the web apps preserves many of the same real-time editing features as its iOS and Mac counterparts. The collection officially supports Chrome, Internet Explorer and (logically) Safari, although you'll likely be waiting awhile to try them: only developers get an iWork beta today, and a public beta is due later this year.
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WWDC 2013: iWork for iCloudSee all photos