The Sleuth Kit is a C++ library and collection of open source file system forensics tools that allow you to, among other things, view allocated and deleted data from NTFS, FAT, FFS, EXT2, Ext3, HFS+, and ISO9660 images.
SD4L is a suite of Linux tools including a graphical user interface which allow the creation of, and access to ScramDisk as well as TrueCrypt encrypted container files. In particular, SD4L provides a Linux driver which enables mounting of containers.