Gimp

other languages: Italian

Gimp is a free application for drawing and image editing.
GIMP is like a professional tool with many features and in no way inferior to professional applications like Photoshop, CorelDraw, etc.

See the official site, e la official documentazione.

On Internet there are many tutorial that explain how to use GIMP.  There is a list of those of my interest:

Tutorial

Logo 2.0 con GIMP (IT), HTML.it

Web 2.0 Text logo (EN)

Gimp Tutorial: Logo-Design ( DE ), YouTube video

Creare un bigliettino da visita con GIMP (IT), YouTube video

Create a grunge business card using GIMP (EN)

Design a business card with the GIMP (EN)

40 + Excellent GIMP Tutorial for designers  (EN)