Alex has written an app that helps with eye strain while using a computer, and is wondering if he should port it to other platforms. Leo says it depends on what the app was written in. Alex wrote it in C++. so Leo advises transitioning it to RT. For Apple, he could write in any language he wants, but he'd need to do it on a Mac. Objective C is good, native choice.
There is a site called AlternativeTo.net, which would allow him to enter in a program name and then will tell him alternatives to it. This doesn't work for getting an alternative to a program on another operating system, though.