DFF (Digital Forensics Framework) is a simple but powerful tool with a flexible module system which will help you in your digital forensics works, including file recovery due to error or crash, evidence research and analysis, etc. DFF provides a robust architecture and some handy modules.
PTK is an alternative advanced interface for the TSK (The Sleuth Kit) suite. It was developed from scratch. Besides providing the functions already present in Autopsy, it implements numerous new features essential during forensic activity. PTK provides a graphical and highly professional interface based on AJAX technology. It also offers a great deal of features like analysis, search, and management of complex cases of digital investigation.
AirSAM is a desktop GUI that compliments the Web based Snort Alert Monitor. AirSAM gives up to date insight into who might be attacking your network. The ultimate goal is to give audio/visual cues right at the time of the attack. AirSAM is an Adobe Air application and should run on Mac OS, Linux, and Windows.
The Cryptographic Implementations Analysis Toolkit (CIAT) is a compendium of command line and graphical tools whose aim is to help in the detection and analysis of encrypted byte sequences within files (executable and non-executable). It is particularly helpful in the forensic analysis and reverse engineering of malware using cryptographic code and encrypted payloads.
Picviz is a parallel coordinates plotter which enables easy scripting from various types of input (such as tcpdump, syslog, iptables logs, or Apache logs) to visualize your data and discover interesting results quickly. Its primary goal is to graph data in order to be able to quickly analyze problems and find correlations among variables. With security analysis in mind, the program has been designed to be very flexible, able to graph millions of events.
check_websites is a very simple virus scanner for Web sites. It checks a document root directory for files with the .js extension and for codewords which might be a hint of defacement or SQL injection. This tool is made to run as a cronjob. There's no output on the screen, but it generates a logfile and mails output.
Yet Another Flowmeter (YAF) is a tool for network flow capture, primarily designed to operate efficiently on white box hardware and generate IPFIX flow records. It is designed to operate primarily on Unix-based systems (including Mac OS X), and is supported by the Network Situational Awareness team at CERT.