The works (text and image) by Leonardo de Oliveira Martins originally presented here are licensed under a Creative Commons Attribution-Share Alike 3.0 Unported License. In a nutshell, you are free to share, copy and modify his works - including for commercial purposes - as long as you accredit him where credit is due and any derived works preserve this license.
The softwares should be licensed under the GNU General Public License, but please verify within the source code for details.