Rekall
Rekall is the most complete Memory Analysis framework.
3 Alternatives To Rekall
Autopsy Forensic Browser
Autopsy is an open source graphical interface to The Sleuth Kit and other digital forensics tools.
Caine
CAINE Computer Aided INvestigative Environment Live CD/DVD, computer forensics, digital forensics
Volatility
Volatility is the open source memory forensics framework for incident response and malware analysis.