Welcome to the Guild Carlo. So, if I understand you Carlo, these are not maps that you have created, but that you are drawing on as examples for the kind of mountains you want to end up with. Given that, you want to know how to reproduce such mountains, and what kind of software you need to do so. Is that right? If so, you are looking for either this tutorial, or this tutorial. Each of these will walk you through the process of map creation, including the mountain-building steps, that were used to create the maps you are using as examples.

Cheers,
-Arsheesh