Use this page to list your favorite multi-platform apps (for BYOT-friendly web sites please use the websites page here). Apps must be available on more than one platform (e,g, iPhone/iPad, Android, Mac, Windows, etc...). Please include as much of the following information as possible:

App name
Category (academic subject area or use)
Short Description of what the app is used for (feel free to include external links to reviews or blog entries)
Available Platforms
Cost (in US $)
Link to developer's site
Any other useful info

App Name
Short description of App and its use
Cost (in US $)
Developer's web site
More info
Note taking
"Capture anything:
Save your ideas, things you like, things you hear, and things you see;

Access anywhere: Evernote works with nearly every computer, phone and mobile device out there.

Find things fast: Search by keyword, tag or even printed and handwritten text inside images." (description copied from developer's web site)
iOS, Android, web
This is a very popular app both in academics and out
Evernotes can sync between devices and the web