ZAPTEST can run cross-platform tests:
You can run the same tests on different OS and on different applications (!) – For example:
If you’ve created a web based test you can run it on any type of Browse, and you can also run the same test on different operating systems:
By using the method “Launch” you can set different types of applications (Such as different types of Browsers) which will be executed and the test will run across each executed app;
To run the same test on different OS, you can use the ZAP Viewer to connect to different machines which have different OS and execute your testing script across each opened machine view.
You can find information and learn how in the Forum -> How-To section:
www.zaptest.com/user-zone/product-training 
