It has commoditized some very expensive software at a low-low price of $0. This has reduced the cost of experimentation and unleashed a giant wave of creativity.
the biggest one of these I know is "Blender", a 3D vfx modeling, animation, shading, and rendering package.
I once read that c compilers were also very expensive before gcc. There's also Gimp to avoid Photoshop. Openoffice/Libreoffice to avoid MS Office. Linux distros to avoid Windows.