libelf lets you read, modify or create ELF files in an architecture-independent way. The library takes care of size and endian issues. For example, you can process a file for SPARC processors on an Intel-based system. This library is a clean-room rewrite of the System V Release 4 library, and is supposed to be source code compatible with it. It was meant primarily for porting SVR4 applications to other operating systems, but can also be used as the basis for new applications (and as a light-weight alternative to libbfd).
Trackfs is a small program that tracks file system changes made by another program (or group of programs). It is similar to "installwatch", but works quite differently. While installwatch uses LD_PRELOAD to intercept library functions like open() and unlink(), trackfs runs the child program(s) with tracing enabled and tracks the system calls they make.
dvbcut is a Qt 3.x application that allows you to select certain parts of an MPEG transport stream (as received via Digital Video Broadcasting) and save these parts into a single MPEG output file. It follows a "keyhole surgery" approach where the input video and audio data are mostly kept unchanged, and only very few frames at the beginning and/or end of the selected range are re-encoded in order to obtain a valid MPEG file.
Clone2fs copies an ext2/ext3 file system to another volume or an image file. Unlike dd, clone2fs does not copy the whole volume but only blocks that are actually in use. Therefore, it is usually faster. It's also faster than dump/restore, tar, or similar backup software because it accesses the source and destination volumes sequentially most of the time.
2.12 obviously doesn't. :-(