Kali Linux is a Linux-based distribution that’s widely used for penetration testing and digital forensics. It has a wide range of tools to help for digital forensics investigations and incident response mechanisms.

Android Studio New Media Fundamentals: Content Production of Digital Audio/Video, Illustration and 3D Animation is a brief primer covering concepts central to digital imagery, digital audio and digital illustration using open source software packages such as GIMP, Audacity and Inkscape.

Signal processing is one of my favorite topics. It is useful in many areas of science and engineering, and if you understand the fundamental ideas, it provides insight into many things we see in the world, and especially the things we hear.