I think iCloud.com is a pretty cool thing that goes completely under the radar. I know plenty of people who have no idea it exists. It's Apple web apps that provide a ton of things that you'd usually have to use your Mac/iPhone for, but actually work in any browser. Pages(!), Numbers, KeyNote(!), Mail, Calendar, AB, Drive, etc.
It's actually surprisingly good and nice, give it a try if you have an Apple-ID: https://iCloud.com