We'd love to at least translate Selling Sunlight in our native language (Italian), but localization is a long and costly process, expecially for a narrative game.
We're certainly considering it, but we want to focus on finishing the game first!
Sadly we are a small team, and we don't really have the resources to work on other platforms at the moment. However we did some preliminary tests on Mac and Linux, and the results were promising.
We don't want to promise you anything yet, but we don't exclude to port the game in the future - probably after release.
Don't see the answer to your question? Ask the project creator directly.