Free geometry software for linux

Custom Geometry is an extension which resizes and positions the window according to your settings.
Custom Geometry adds a button to the Firefox status bar that will resize the Firefox window to your specifications. Many other extensions will resize the window, but only to preset dimensions, such as 1024x768 or 800x600. Custom Geometry will set the window to an arbitrary size.
I needed this functionality because I prefer my browser window to be in a particular location and size on my screen. Since Im using Microsoft Windows XP, the prospect of the browser window staying where I want it is dim. A video game, misclick, or even just a popup window (usatoday.com anyone?) will resize the window. Now, a single click gets it back into place.
Instructions:
1. Open the CustomGeometry-1.0.0.xpi file in Firefox 2.0.
2. Choose to install the extension.
3. Restart Firefox when instructed to do so.
4. Open the addons window by clicking "Tools," then "Add-ons."
5. Select "Custom Geometry" from the list.
6. Click the "Options" button.
7. Set the window geometry options that you prefer.
8. Hit "OK" to save your preferences.
9. Click the new icon on the lower right right side of the status bar to apply these settings at any time.
Enhancements:
- Added support for Thunderbird.
- Fixed a case issue causing the icon not to work under case-sensitive filesystems (Linux).

GeoGebra project is a dynamic mathematics software that joins geometry, algebra, and calculus.

Two views are characteristic of GeoGebra: an expression in the algebra window corresponds to an object in the geometry window and vice versa

Geomview is an interactive 3D viewing program for Unix. Geomview lets you view and manipulate three-dimensional objects: you use the mouse to rotate, translate, zoom in and out, and so on.

Geomview can be used as a standalone viewer for static objects or as a display engine for other programs which produce dynamically changing geometry. Geomview can display objects described in a variety of file formats. Geomview comes with a wide selection of example objects, and you can create your own objects too.

Geomview runs on most Unix platforms, including GNU/Linux. Geomview can run under Microsoft Windows using Cygwin. Geomview is free software available under the terms of the GNU Lesser General Public License (GPL).

You can also use Geomview to handle the display of data coming from another program that is running simultaneously. As the other program changes the data, the Geomview image reflects the changes. Programs that generate objects and use Geomview to display them are called external modules. External modules can control almost all aspects of Geomview. The idea here is that many aspects of the display and interaction parts of geometry software are independent of the geometric content and can be collected together in a single piece of software that can be used in a wide variety of situations. The author of the external module can then concentrate on implementing the desired algorithm and leave the display aspects to Geomview. Geomview comes with a collection of sample external modules, and the manual describes how to write your own.

Geomview allows multiple independently controllable objects and cameras. It provides interactive control for motion, appearances (including lighting, shading, and materials), picking on an object, edge or vertex level, snapshots in many image file, PostScript, or Renderman RIB format, and adding or deleting objects is provided through direct mouse manipulation, control panels, and keyboard shortcuts.

Geomview supports the following simple data types: polyhedra with shared vertices (.off), quadrilaterals, rectangular meshes, vectors, and Bezier surface patches of arbitrary degree including rational patches. Object hierarchies can be constructed with lists of objects and instances of object(s) transformed by one or many 4x4 matrices. Arbitrary portions of changing hierarchies may be transmitted by creating named references.

The full specification for object file formats is in the OOGL (Object Oriented Graphics Language) Reference section of the Geomview manual. If you already have Geomview you might want to try out the OOGL tutorial.

Geomview can be used as a Mathematica graphics output device; this makes viewing Mathematica graphics much more interactive. The same is true for Maple. Geomview began as an effort at the Geometry Center at the University of Minnesota to provide interactive geometry software which is particularly appropriate for mathematics research and education. In particular, Geomview can display objects in hyperbolic and spherical space as well as Euclidean space.

Geom is an interactive geometry application.

Geometry application in the style of the Geometers Sketchpad or DrGeo.

Geom uses CCC as a canvas, which in turn uses Cairo. With the near deprecation of GNOME Canvas using any canvas that doesnt uses Cairo is a waste of time.

Right now, the project is in pre-alpha state, but you can start using it to play a little. You will need to download and install CCC; besides that, only Gtk+ and libglade are required.

If you dont want to use the bleeding edge, here I put two tarballs, one of CCC and another one of Geom. The CCC one is a modified version of mine (Im trying to help Sven in CCC, but hes busy and sometimes it takes time to get my patches in), and a semi working version of Geom.

If you find bugs in this version of CCC, dont bother Sven with them, they are probably my fault. And if you use the current git version of CCC, be warned that Geom segfaults with it.

GOCR is an OCR (Optical Character Recognition) program, developed under the GNU Public License. It converts scanned images of text back to text files. Joerg Schulenburg started the program, and now leads a team of developers.

GOCR can be used with different front-ends, which makes it very easy to port to different OSes and architectures. It can open many different image formats, and its quality have been improving in a daily basis.

GOCR or JOCR?

The original name is GOCR. Its what is used internally in the sources. But, when registering the site at Sourceforge, gocr was already taken. So, its kind of both. Yeah, we know.

Some examples of how you can use gocr:

gocr -h # help
gocr file.pbm # minimum options
gocr -v 1 file.pbm >out.txt 2>out.log # generate text- and log file
djpeg -pnm -gray text.jpg | gocr - # using JPEG-files
gzip -cd text.pbm.gz | gocr - # using gzipped PBM-files
giftopnm text.gif | gocr - # using GIF-files
gocr -v 1 -v 32 -m 4 file.pbm # zoning and out30.bmp output
xli -geometry 400x400 out30.bmp # see details using xli (recommanded viewer)
wish gocr.tcl # X11-tcl/tk-frontend (development version)
# see manual pages for more details

Gabedit is a Graphical User Interface to Gaussian, Molcas, Molpro and MPQC computational chemistry packages.
Gabedit includes graphical facilities for generating keywords and options, molecule specifications and ther input sections for even the most advanced calculation types Gabedit includes an advanced Molecule Builder.
You can use it to rapidly sketch in molecules and examine them in three dimensions. You can build molecules by atom, ring, group, amino acid and nucleoside. You can also read geometry from a file. Most major molecular file formats are supported.
Gabedit includes a Gaussian, Molcas, Molpro and MPQC Calculation Setup window which allows you to set up Gaussian, Molcas, Molpro and MPQC jobs in a simple and straightforward manner.
Gabedit includes a text editor for editing Molcas, Molpro, Gaussian and MPQC input files.
Gabedit can graphically display a variety of Gaussian, Molcas, Molpro, MPQC and (partially) ADF calculation results, including the following:
- Molecular orbitals.
- Surfaces from the electron density, electrostatic potential, NMR shielding density, and other properties.
- Surfaces may be displayed in solid, translucent and wire mesh modes.
- Surfaces can be colored by a separate property.
- Contours (colorcoded).
- Planes (colorcoded).
- Dipole
- XYZ axes and the principal axes of the molecule.
- Animation of the normal modes corresponding to vibrational frequencies.
- Animation of the rotation of geometry, surface, dipole, xyz and the principal axes of the molecule.
- Animation of contours.
- Animation of colorcoded planes.
Gabedit can display IR and Raman computed spectra. Gabedit can generate a povray file for geometry (atoms + bonds, including hydrogens bond), surfaces (including colorcoded surfaces), contours, colorcoded planes.
Gabedit can save picture in PPM, BMP , (JPEG) and PS format. Gabedit can generate automatically a series of pictures for animation (vibration, geometry convergence, rotation, contours, colorcoded planes).

powerPlant is a geometry generator and editor. powerPlant is specially suitable to generate terrain and plant models. The geometry generation is based on custom implementations of L-Systems, Turtle-Interpretation and the Diamond-and-Square algorithm.

powerPlant is composed of a Java application supplying the application logic and external Haskell programs for geometry generation.

The application is intended to create complex, realistic models by supplying a minimum ammount of parameters instead of explicit modelling. Created models can be combined recursively to make up complete scenes. This scene creation is presented in a WYSIWYG tree view. The integrated terrain tool can also be used to generate various coloured, tileable textures.

Every work result (models, scenes) can be loaded and saved in a xml file. User interaction takes place in a convenient Java Swing GUI that brings together all the aspects of the application.

The chosen approach should significantly shorten the process of creating adequate 3D-models and entire virtual landscapes with realtime visualization. Visualization is based on OpenGL/GLU API and includes adjustable speed optimizations.

KLcdDimmer is a KDE applet to adjust LCD brightness.
To adjust the brightness simply click with the mouse left button and use the slider
KLcdDimmer relies on an external program to get/set the brightness, such as smartdimmer or nvclock.
For instance, Ive used
- SmartDimmer
- NVclock
but it is supposed to work also with others, since you can configure the applet.
Installation:
When you run configure, you should pass the KDE root directory as --prefix (in my system it is /usr).
The steps to perform for the installation are standard for packages in source form: once you have unpacked the sources in a directory, `cd to the directory containing the packages source code and execute the following steps:
./configure --prefix=
make
make install (as root)
Then youll be able to add the applet to the panel, by using your KDE panel.
Enhancements:
- Fixed tooltips and added whats this helps
- Fixed geometry (now should fit the panel better)