App Cross Platform Cross Reference. Anyone doing one?

It just occurred to me that there are many of us that work on one platform on our desktop, but different on our phones or tablets.

Does anyone know of any source for lists of applications that can utilize the same data on each environment? I am thinking that a good cross reference would be good to help us select applications on each environment and if some resource became popular enough, it could lead software vendors to support a variety of data formats in each environment they support, or provide import/export capabilities to support those of us who use multiple platforms.

My personal preference is to use open source or free/inexpensive software, but the need becomes greater when tools in those realms don't exist.

If nobody knows of an existing source, I think I might start something... A listing of programs that can share files for two or more of the following platforms would be a start:

Windows Desktop
Windows Metro (or whatever they are calling it)
Android
IOS
Linux

In my mind, a program would be included if any of the following applied:

a) Versions exist for multiple platforms
b) Works via web
c) Works directly with files from an app on a different platform
d) Exports files to standard formats for use by others (comma delimited, xml, JSON etc)

My personal ideal would be to have an app in each environment I use that exploits the interface of that environment well, and shares data transparently with an app on one of my other devices. For me, I also want apps that do not require network access except when transmitting or receiving data to synchronize (probably via SkyDrive or some other cloud storage).

Thoughts?