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XWorld displays a pretty picture of our earth as it would look if viewed from the direction of the sun. The window is regularly updated. You can use xworld in lieu of a clock.

JOSM is the "Java OpenStreetMap Editor". It is a feature-rich editor for the experienced OSM mapper. It requires some configuration efforts. But if you intend to become a great OSM mapper, it's worth the time you need to get used to it.

The tecla library provides UNIX and LINUX programs with interactive command line editing facilities, similar to those of the Unix tcsh shell. In addition to simple command-line editing, it supports recall of previously entered command lines, TAB completion of file names or other tokens, and in-line wild-card expansion of file names. The internal functions which perform file-name completion and wild-card expansion are also available externally for optional use by programs, along with a module for tab-completion and lookup of file names in a list of directories. Note that special care has been taken to allow the use of this library in threaded programs. The option to enable this is discussed in the Makefile, and specific discussions of thread safety are presented in the included man pages.

PGPLOT is a Fortran subroutine package for drawing graphs on a variety of display devices. For more details, see the manual ``PGPLOT Graphics Subroutine Library'', available from T. J. Pearson. The CPGPLOT library adds an intermediate level of wrapper functions between C programs and the PGPLOT library. These functions hide the system dependencies of calling PGPLOT behind a system independent interface. Documentation and demo programs are included.

Astrolog is a many featured and customizable astrology chart calculation program for DOS, Windows, Mac, and Unix, used in 30+ countries on six continents. It is 100% freeware and requires no registration fee. :) The complete source code is available. Astrolog features: wheels, aspects, midpoints, relationship charts, transits, progressions, some interpretations, astro-graphy, local horizon, constellations, planet orbits, dispositors, various influence charts, biorhythms, different zodiacs, central planets, 14 house systems, 8400 year ephemeris, asteroids, Uranians, fixed stars, Arabic parts, script files and macros, interactive PC & MS/X11 Windows graphics, smooth animation of charts, graphic files in PostScript, Windows metafile, and bitmap formats, and more!