Zerotools are a set of tools to aid keeping virtual disks clean by filling binary zero to those regions which are no longer in "use". This is done on-the-fly or manually, depending on which tool suits the needs best. The tools do not compete with other programs that rewrite removed files in order to make their restoration close to impossible. Zerotools are mostly useful for people who compress or archive virtual machines constantly. The tools are run inside the virtualized Linux system and are distribution-agnostic.
The mscompress package contains two programs: msexpand, which decompress files compressed by the Microsoft compress.exe utility (e.g. Win 3.x installation files) and mscompress, which compresses files using the LZ77 compression algorithm. Output files can be decompressed using Microsoft expand.exe or msexpand.
MPIBZIP2 is a parallel implementation of the bzip2 block-sorting file compressor that uses MPI and achieves significant speedup on cluster machines. The output of this version is fully compatible with bzip2 1.0.2 or newer (i.e. anything compressed with MPIBZIP2 can be decompressed with bzip2).
Freedup finds and eliminates duplicate files by linking them, and thus reduces the amount of used disk space within one or more file systems. By default, hardlinks are used on a single device, symbolic links when the devices differ. A set of options allows you to modify the methods of file comparison, the hash functions, the linking behavior, and the reporting style. You may use batch or interactive mode. Freedup usually only considers identical files, but when comparing audio or graphics files, you may elect to ignore the tags.
Shoelacer attempts to generate a pair of small C functions that compress or decompress a set of data (primarily short strings) presented to it, and possibly other data of that kind. The data it is given may consist of entries of just a few bytes or longer. Its goal is to be reasonably fast with a tiny memory overhead. Compression performance is not so much the goal, although it certainly isn't ignored.
NexentaStor is a unified storage solution that installs on standard hardware and provides enterprise class storage at a fraction of the cost of legacy, proprietary storage solutions. NexentaStor is particularly well suited for virtualized environments thanks to the ability of NexentaStor to eliminate duplication of primary data storage, to manage the storage for virtual environments from one interface, and to leverage SSDs to address the random I/O and boot storm issues with virtual environments.