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ECM (Error Code Modeler) compresses CD image files (such as BIN, CDI, NRG, CCD, or similar) by stripping unnecessary EDC/ECC data. The space saved depends on the number of sectors with unnecessary EDC/ECC data in them, which will depend on the specific type of CD.

Lzip is a lossless data compressor with a user interface similar to the one of gzip or bzip2. Lzip decompresses almost as fast as gzip and compresses more than bzip2, which makes it well suited for software distribution and data archiving. Lzip is a clean implementation of the LZMA algorithm. The lzip file format is designed for long-term data archiving. It is clean, provides very safe four factor integrity checking, and is backed by the recovery capabilities of lziprecover.

[ excerpt from developer's web site ] JZlib is a re-implementation of zlib in pure Java. The first and final aim for hacking this stuff is to add the packet compression support to pure Java SSH systems. - Why JZlib? Java Platform API provides packages 'java.util.zip.*' for accessing to zlib, but that support is very limited if you need to use the essence of zlib. For example, we needed to full access to zlib to add the packet compression support to pure Java SSH system, but they are useless for our requirements. The Internet draft SSH Transport Layer Protocol says in the section '4.2 Compression' as follows,

LZX compression engine, suitable for creating compressed CHM files. Or for use in a CAB-making utility or for any other purpose LZX is useful for.

libzip is a C library for reading, creating, and modifying zip archives. Files can be added from data buffers, files, or compressed data copied directly from other zip archives. Changes made without closing the archive can be reverted. The API is documented by man pages.

makeself is a (very small) shell script that makes neat self-extracting shell scripts, and allows you to specify a "setup" command to execute upon finishing. It's sorta like the Windows winzip self-extracting archives.

PackdDir creates and unpacks PackdDir archives, which are used in Quake (I and II) and others.

Mark Adler, maintainer of popular zlib library has released a multicore capable Parallel Implementation of GZip, nicknamed PIGZ. Version 1.5 implements nearly all of gzip's functionality, including decompression of .gz and .Z (Unix compress) files.

Linux ports of KZIP and ZIPMIX by Ken Silverman. A PKZIP-compatible compressor focusing on space over speed. KZIP creates smaller .ZIP files than PKZIP with maximum compression enabled and even beats 7-Zip most of the time.

Celestia is a free real-time space simulation that lets you experience our universe in three dimensions. Unlike most planetarium software, Celestia doesn't confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy. All travel in Celestia is seamless; the exponential zoom feature lets you explore space across a huge range of scales, from galaxy clusters down to spacecraft only a few meters across. A "point-and-goto" interface makes it simple to navigate through the universe to the object you want to visit. Celestia is expandable. It comes with large catalog of stars, galaxies, planets, moons, asteroids, comets, and spacecraft. If that's not enough, you can download dozens of easy to install add-ons with more objects.