Which os-dependant tools do you mean? gcc against Microsoft compiler? BTW: Comparing platform-dependant tools based on comparisons of MS against the rest might give wrong numbers. But you might try the other way round: Compare the numbers of people using the non-native systems on the other platform, i.e. gcc users under Windows and msvc under Linux
![Wink :wink:](./images/smilies/icon_wink.gif)
Moreover I'd say that any good render engine must have support for other systems nowadays. Even if you target only game development the support for consoles often requires high portability which can be easily proved by porting to Linux and OSX. And if you are not into game development (like me, doing scientific projects with 3d simulations) it is a major requirement to support Linux or Unix systems.