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== Science, Technology, and Engineering Applications==
What .. you thought Ubuntu was just for play? Also see [https://help.ubuntu.com/community/OtherSoftware Ubuntu Science].

=== Health applications ===
{{WorldVistA}}

=== CAD ===
*[http://www.ribbonsoft.com/qcad.html QCAD] is a commercial CAD alternative to AutoCAD with a community open source edition. Install:
 sudo apt-get install qcad

*[http://www.varicad.com/ VariCAD] is a commercial 3D CAD package for multiple platforms (including Linux). There is no open source or community version.

=== Mathematical solutions ===
[http://www.scilab.org/ Scilab], Octave, and Freemat are three open source solutions for solving complex mathematical equations.
==== Octave ====
Gnu [http://www.gnu.org/software/octave/about.html Octave] is a free, open source (GPL licensed) platform for solving linear and non-linear equations, similar to (and mostly compatible with) Matlab. It interfaces well with [http://www.gnuplot.info/ Gnuplot]. For troubleshooting tips, see [http://ubuntuforums.org/showthread.php?t=1034174 this thread]. Install:
 sudo apt-get install octave3.0

Also recommended:
 sudo apt-get install libatlas3gf-base gnuplot qtoctave

Note: [https://forja.rediris.es/frs/?group_id=60&release_id=299 QTOctave] is a GUI for Gnuplot or Easyplot 1.1, and and the ATLAS library is an algebra-software-optimization set of utilities.

[http://www.amion.com/ep/eplot.html EasyPlot 1.1] is an alternative to GnuPlot, with a [https://forja.rediris.es/frs/?group_id=60&release_id=299 version] that can be used with QTOctave. It must be installed from source.

An older GUI for Octave/Gnuplot is [http://www.xm1math.net/qgfe/ qgfe] (available as the package qgfe).

==== Freemat ====
[http://freemat.sourceforge.net/ Freemat] is a free, open source (GPL licensed) platform for solving linear and non-linear equations, similar to (and mostly compatible with) Matlab. Install from Add/Remove Programs (Edutainment) or 
 sudo apt-get install freemat

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=== LabVIEW ===
[http://www.ni.com/linux/labview.htm LabVIEW] is a leading platform for designing test, measurement, and control systems.  You can build applications that range from simple temperature monitoring to sophisticated simulation and control systems.
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=== Amateur Radio applications ===
[http://www.w1hkj.com/Fldigi.html Fldigi] is a free, open-source (GPL) application for digital-mode amateur radio communications using a sound card.  Enable "Community Maintained Software (universe)" in Software Sources; then install either from Add/Remove Programs under (Amateur Radio) or by typing
 sudo apt-get install fldigi

=== Amateur Electronics ===
==== Arduino ====
[http://www.arduino.cc/ Arduino] is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, and hobbyists interested in creating interactive objects or environments. See this [http://www.codetorment.com/2009/11/02/tutorial-getting-started-with-arduino-ide-on-linux-ubuntu-9-10/ tutorial].