Sure it was for 4e? There used to be a huge collection for 3.x but I've never seen one for 4e because, well, you don't need them unless they're companions.
It is easy to download. Just save the page: Choose "Save As Web Page, complete" into the folder of you choice.
Then you can call it up anytime by double-clicking on the INDEX html file, or create a shortcut to the index file. It will pop right up in your web browser, even when working off-line.