Recently I faced one very interesting task. I had to port an application from one platform (Windows) to another (Linux). It is an interesting topic. First, knowledge of several platforms and writing the code for them is a good experience for every developer. Secondly, writing an application for different platforms makes it widespread and needed by many. So, I would like to share my impressions concerning this process. This article is intended for everybody who wants to write a cross-platform application.