Free planet earth software for linux

RSS-Planet is a custom marker file generator for xplanet which uses RSS feeds from news websites to plot the current headlines on a world map.

By default, Yahoo! News and CNN.com are supported, but other feeds that point to articles with easily-discoverable place names (such as the Washington Post) should work as well.

Planets is a simple interactive program for playing with simulations of planetary systems, released under the GPL. The project runs on Linux and Windows, and could doubtless be ported to your favorite flavor of Unix.
Planets was originally designed for kids, in particular, for my then 4-year old nephew who is fascinated by astronomy. The user interface is aimed at being simple enough that a fairly young kid can get some joy out of it. But the adults who have used it have found it to be pretty fun as well.
The code is not bug-free, and Planets is missing some significant features. But its pretty stable and is a fun toy to play with. If you do download it, please drop me an email and tell me about your experience with it.
Main features:
- Saving and loading of universes
- Infinite undo (erase last action) and goback (return to point in time just after last action). This allows for undoing mistakes and replaying interesting configurations.
- Traces of planet trajectories
- Two ways of dealing with planet collisions:
- merges, where the colliding planets are merged into one planet, and
- bounces, where the colliding planets are bounced off each other elastically. This itself comes in two varieties:
- force bouncing, where the force between planets is made repulsive at close quarters.
- true bouncing, where simple pool-table physics calculations are made to determine when planets collide, and compute the appropriate bounce from said collision.
- kidmode, a mode where the focus is (mostly) locked on the application, and interesting changes are initiated by merely banging on the keyboard. This mode is aimed at 1-5 year olds.
- Center-of-mass following: it is possible to follow the center of mass of a subset of the planets. Thus, if you have a sun-moon-planet system, you can have the view automatically track the moon-planet pair.
- Can display kinetic, potential and total energy of the system.
- Both the gravitational constant and the gravitational exponent can be changed.
- There is a simple control panel that makes it possible to see and change the simulation options.
- Zooming, panning, and centering on the center of mass.

Invade Earth is an open-source implementation of the popular board game Risk 2210 AD.
Invade Earth includes a map editor, support for variant rules including Classic and Secret Mission modes, and a network play mode.
Main features:
- Multiple rule sets and maps:
- Invade Earth A.D. 2210
- Amoeba Invasion Expansion
- Mars Expansion
- Pantheon Expansion (our version of Risk: Godstorm) (coming soon)
- Classic
- Secret Mission
- Custom rule values
- A versatile Map Editor
- Several built-in AIs (play against the computer)
- Network support (play against your friends)
- A centralized list of open internet games
- Save and load game states, even over a network
- Watch a replay of saved games

Earth allows you to find files across a large network of machines and track disk usage in real time. The project consists of a daemon that indexes filesystems in real time and reports all the changes back to a central database.
This can then be queried through a simple, yet powerful, web interface. Think of it like Spotlight or Beagle but operating system independent with a central database for multiple machines.
Earth is initially focused on managing the explosion of data that occurs in digital visual effects work.
Enhancements:
- Many small usability improvements, several significant performance improvements for the Web application, reduced database size, code improvements, and a much improved command line interface to the Earth daemon.

Invade Earth Server is a server for the Invade Earth game, for network play.
Main features:
- Multiple rule sets and maps:
- Invade Earth A.D. 2210
- Amoeba Invasion Expansion
- Mars Expansion
- Pantheon Expansion (our version of Risk: Godstorm) (coming soon)
- Classic
- Secret Mission
- Custom rule values
- A versatile Map Editor
- Several built-in AIs (play against the computer)
- Network support (play against your friends)
- A centralized list of open internet games
- Save and load game states, even over a network
- Watch a replay of saved games

Invade Earth Map Editor is a map editor for Invade Earth game.
Main features:
- Multiple rule sets and maps:
- Invade Earth A.D. 2210
- Amoeba Invasion Expansion
- Mars Expansion
- Pantheon Expansion (our version of Risk: Godstorm) (coming soon)
- Classic
- Secret Mission
- Custom rule values
- A versatile Map Editor
- Several built-in AIs (play against the computer)
- Network support (play against your friends)
- A centralized list of open internet games
- Save and load game states, even over a network
- Watch a replay of saved games

PDL::Transform::Cartography Perl module contains useful cartographic projections.

SYNOPSIS

# make a Mercator map of Earth
use PDL::Transform::Cartography;
$a = earth_coast();
$a = graticule(10,2)->glue(1,$a);
$t = t_mercator;
$w = pgwin(xs);
$w->lines($t->apply($a)->clean_lines());

PDL::Transform::Cartography includes a variety of useful cartographic and observing projections (mappings of the surface of a sphere), including reprojected observer coordinates. See PDL::Transform for more information about image transforms in general.

Cartographic transformations are used for projecting not just terrestrial maps, but also any nearly spherical surface including the Sun, the Celestial sphere, various moons and planets, distant stars, etc. They also are useful for interpreting scientific images, which are themselves generally projections of a sphere onto a flat focal plane (e.g. the t_gnomonic projection).

Unless otherwise noted, all the transformations in this file convert from (theta,phi) coordinates on the unit sphere (e.g. (lon,lat) on a planet or (RA,dec) on the celestial sphere) into some sort of projected coordinates, and have inverse transformations that convert back to (theta,phi). This is equivalent to working from the equidistant cylindrical (or "plate caree") projection, if you are a cartography wonk.

The projected coordinates are generally in units of body radii (radians), so that multiplying the output by the scale of the map yields physical units that are correct wherever the scale is correct for that projection. For example, areas should be correct everywhere in the authalic projections; and linear scales are correct along meridians in the equidistant projections and along the standard parallels in all the projections.

The transformations that are authalic (equal-area), conformal (equal-angle), azimuthal (circularly symmetric), or perspective (true perspective on a focal plane from some viewpoint) are marked. The first two categories are mutually exclusive for all but the "unit sphere" 3-D projection.

Extra dimensions tacked on to each point to be transformed are, in general, ignored. That is so that you can add on an extra index to keep track of pen color. For example, earth_coast returns a 3x< n > piddle containing (lon, lat, pen) at each list location. Transforming the vector list retains the pen value as the first index after the dimensional directions.