Eben gives you a crash course in how modern processors work to explain why Raspberry Pi is unaffected by the Spectre and Meltdown security vulnerabilities.
Hackersh ("Hacker Shell") is a free and open source shell (command interpreter) written in Python with Pythonect-like syntax, builtin security commands, and out of the box wrappers for various security tools. It is like Unix pipeline, but for processing security information and metadata rather than bytes.
KeePass is a free/open-source password manager or safe which helps you to manage your passwords in a secure way. You can put all your passwords in one database, which is locked with one master key or a key-disk.
a free, open-source, light-weight and easy-to-use password safe for Windows. You can store your passwords in a highly-encrypted database locked with one master key or key-disk.
Linux Video Camera and CCTV (close circuit TV) security and surveillance solution with Motion Detection also support web and semi-automatic control of Pan/Tilt/Zoom cameras using a variety of protocols.
a general purpose monitoring platform. provides a framework dealing with (among others) packet demultiplexing, timers, threads and communication. This allows programmers to concentrate on the precise functionnalities they want to implement...
PktFilter is a software that can configure the IP filtering device driver found in Windows 2000/XP/Server 2003, with filtering rules following a syntax similar to IP Filter