Apple announced the web based iWork Suite (Pages, Numbers and keynote) at WWDC 2013. iWork for iCloud is currently under beta and now anyone can access it. Just visit beta.icloud.com and login with your Apple ID to access these beta apps. All you need is a latest version of modern browser.
These web based apps are similar to keynote, pages and numbers for iPhone and iPad.
Note : iWork for iCloud is under beta, make sure you have a backup of your file in your PC.
iWork for iCloud lets you create beautiful documents, spreadsheets, and presentations using Pages, Numbers, and Keynote in your browser on a Mac or PC.
As a Registered Apple Developer, you can be one of the first to use the beta of iWork for iCloud. To get started, simply go to beta.icloud.com with the latest version of Safari, Chrome, or Internet Explorer and sign in with the Apple ID associated with your Registered Apple Developer account.
Please note that these web apps are in beta and it’s important that you regularly maintain a local backup of your documents.