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Unzoo is a zoo archive extractor written by Martin Schoenert. If unzoo is called with no arguments, it will first print a summary of the commands and then prompt for command lines interactively.

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.

LHa for UNIX with autoconf

XMill is a new tool for compressing XML data efficiently. It is based on a regrouping strategy that leverages the effect of highly-efficient compression techniques in compressors such as gzip. XMill groups XML text strings with respect to their meaning and exploits similarities between those text strings for compression. Hence, XMill typically achieves much better compression rates than conventional compressors such as gzip.

Zipper is a tool for extracting and viewing archive files in GNUstep. LICENSE: Public Domain

The Zip-Ada library is written entirely in Ada, allowing compression operations without any OS-dependent external calls on streams and files. In addition to the library and command-line demos, it has these tools: * zipada - create compressed Zip archive * comp_zip - utility to compare contents of two Zip archives * find_zip - utility to search for text stream of Zip archive * rezip - tool for recompressing Zip archives towards optimal compression * debzip2 - tool to decompress BZip2 compressed files (.bz2)

Zstd, short for Zstandard, is a real-time compression algorithm providing high compression ratios. It offers a very wide range of compression vs. speed trade-offs while being backed by a very fast decoder. It offers a special mode for small data called "dictionary compression" and it can create dictionaries from any sample set. Zstd is BSD-licensed. Using Izbench on the Silesia compression corpus, zstd ranked at the top with a compression ratio of 2.877, a compression rate of 325 Mb/s, and a decompression rate of 325. Zlib followed at 2.730, 95 Mb/s (C) and 360 Mb/s (D). See WWW page for the full benchmark results.

Accrete is a physical simulation of solar system planet formation, originally published to Usenet-- probably comp.sources.unix-- in 1991 by Joe Nowakowski. This software is in the public domain. This simulation works by modelling a dust cloud around a Sun-like star, injecting a series of masses which collect dust, and form planets. The simulation then determines what the planetary environments will be like in terms of temperature, atmospheric composition, and other factors. The system description is saved to a file named "New.System".

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.

KStars is a desktop planetarium for KDE. It provides an accurate graphical simulation of the night sky, from any location on Earth, at any date and time. The display includes up to 100 million stars, 13,000 deep-sky objects, all 8 planets, the Sun and Moon, and thousands of comets and asteroids.