If you are looking for a comprehensive Forensics And Incident Response toolkit, the answer is CAINE (Computer Aided INvestigative Environment).
CAINE offers a complete forensic environment that is organized to integrate existing software tools as software modules and to provide a friendly graphical interface.
CAINE represents fully the spirit of the Open Source philosophy because the project is completely open, everyone could take on the legacy of the previous developer or project manager. The distro is open source, the Windows side is freeware and, the last but not least, the distro is installable, thus giving the opportunity to rebuild it in a new brand version, so giving a long life to this project.
Here you can download the CAINE free ISO image. The ISO fits approx. 3800 MB.