Very interesting incident response framework focused on remote live forensics:
https://github.com/google/grr/
How to extract data from a broken NTFS drive
Good blogpost about NTFS reconstruction:
https://eforensicsmag.com/extracting-data-damaged-ntfs-drives-andrea-lazzarotto/
Free computer forensic tools
Forensics Control has published a list of 130 free forensic tools, chekt it out at http://forensiccontrol.com/resources/free-software/