Free circle software for linux

The Circle is an open source scalable decentralized peer to peer application. What does that mean? Well, theres no central authority running the show. No entry taxes either, no censorship, and (in theory) no weak point which can break the whole system.
No one even owns the source code. As long as there is one Circle peer running, anywhere in the world, theres still a network.
Main features:
- Share files
- Send instant messages and chat IRC-style
- Put together your own personalized, trust based news service
- Proxy Debian package downloads
The Circle is written in Python. It runs on Linux and Windows. (in fact, there is very little operating system specific code, so it will most likely work on any system that supports Python)
Scalability
At the core of the Circle is a decentralized hashtable, or "Chord". This table allows users to search for files in logarithmic time, based on keywords. This means that the Circle does not have the scalability problems of Gnutella style network (such as Kazaa, eDonkey), while also avoiding the need for a central server and therefore a single point of failure. Details of its operation are given in the "Technical Details" section below.
Privacy
The Circle does have the ability to post fully anonymous news a la Freenet. However, the file-sharing protocol isnt entirely anonymous. People will be able to work out your IP address.
In order to protect user privacy, the Circle includes a Digital Rights Management system. Although everybody can search your files by their keywords, you may choose which users are authorized to download them. An unauthorized third party has access only to the names of your files, not to their content. Needless to say, we expect you to use this system in order to prevent copyright infringement, while allowing private copy.
Note: If we become aware that you are trying to share snuff or child pornography, we will be able to work out your IP and from that your location and identity, and report you to the police and/or your ISP. Snuff and child pornography are things we think any reasonable person considers to be evil (its an issue quite separate from the debate over copyright).

The Circle is an open source scalable decentralized peer to peer application. What does that mean? Well, theres no central authority running the show. No entry taxes either, no censorship, and (in theory) no weak point which can break the whole system. No one even owns the source code. There is a network, even if there are a few people which uses this program.

The Circle allows you to :

* Share files
* Send instant messages and chat IRC-style
* Put together your own personalized, trust based news service
* Proxy Debian package downloads

The Circle is written in Python. It runs on Linux and Windows. (in fact, there is very little operating system specific code, so it will most likely work on any system that supports Python).

At the core of the Circle is a decentralized hashtable, or "Chord". This table allows users to search for files in logarithmic time, based on keywords. This means that the Circle does not have the scalability problems of Gnutella style network (such as Kazaa, eDonkey), while also avoiding the need for a central server and therefore a single point of failure. Details of its operation are given in the "Technical Details" section below.

The Circle does have the ability to post fully anonymous news a la Freenet. However, the file-sharing protocol isnt entirely anonymous. People will be able to work out your IP address.

In order to protect user privacy, the Circle includes a Digital Rights Management system. Although everybody can search your files by their keywords, you may choose which users are authorized to download them. An unauthorized third party has access only to the names of your files, not to their content. Needless to say, we expect you to use this system in order to prevent copyright infringement, while allowing private copy.

Note: If we become aware that you are trying to share snuff or child pornography, we will be able to work out your IP and from that your location and identity, and report you to the police and/or your ISP. Snuff and child pornography are things we think any reasonable person considers to be evil (its an issue quite separate from the debate over copyright).

jPicEdt is a multi-platform vector-based graphic editor for LaTeX and related packages, including eepic and PsTricks.
The LaTeX picture environment is a special environment for inserting simple drawing commands into a LaTeX file.
This environment was obviously not intented to replace more sophisticated graphical formats such as Postscript or PDF (and their associated design tools: Adobe Illustrator, Macromedia Freehand,...), but was merely aimed at easily incorporating small and simple drawings (e.g. graphs, electrical schematics,...)
Yet picture commands are flexible enough to allow one to build rather complicated drawings, including circles, rectangles, lines and vectors, bezier splines.
Besides, using epic/eepic or PsTricks packages largely increases the set of available commands, and amongst other things, allows for shape-filling (and colours with PsTricks) and a better rendering of shapes.
Finally, one of the main benefits of using the picture environment is the ability to incorporate text containing any LaTeX command allowed in LR mode, e.g. equations, arrays or user-defined commands.
Main features:
- Every graphical element allowed by the picture environment commands: lines, arrows, circles, boxes.
- Emulated elements, for example lines of any slope (which LaTeX doesnt support natively), circles of any size, ellipses, arcs and polygons. This makes a strong use of the multiput command.
- Nearly every object allowed by the epic/eepic packages (excluding grids and textured filling): dashed lines, filled (whitened, blackened or shaded) ellipses or polygons, arcs,... Using this package is optional.
- Starting from version 1.3.2, nearly every object in the pstricks.sty package (this include : filling with colors, hatches, textures, setting various stroke parameters, rotating texts,...). Support for pst-node.sty and other related packages is either experimental (meaning that you must recompile with a boolean flag turned on) or simply underway.

KIconEdit or KDE Icon Editor is a small graphics drawing program especially for creating icons using the standard KDE icon palette.

KIconEdit has most of the tools which are needed for easy creation of icons including: Line, Ellipse, Circle, Rectangle, Freehand, Eraser and Spraycan. More tools are planned but not fully implemented.

KIconEdit is part of the K Desktop Environment (KDE).

Frocor stands for F Resonating Objects Correlator and is a sound- graphics installation.
Changes of properties of a Frocor object will result in changes of both the graphics and the sound output.
Main features:
It is based on some parallels between sounds and geometric objects:
Geometry
- Shape (Circle / Triangle / ...)
- Size
- Color
- Animation (Spinning)
Acoustics
- Sound Shape (Sine / Triangular / ...)
- Volume
- Frequency
- Sweep
Enhancements:
- 10/05/2005: first public frocor release: 0.1!

KChart is the KOffice chart drawing application part of the KOffice suite. Use it to embed charts into your KOffice documents, e.g. a report written with KWord or a slideshow made with KPresenter.
Main features:
Easy to Use:
- default values for all parameters
- automatic ordinate axis computation based on highest/lowest data value
- default sizes (fonts, line widths...) relative to the window size
Highly Configurable:
- All of the parameters may be changed after configuring/drawing the chart.
- Size values (axis/grid line width, font sizes, bar width, dataset gap, pie chart radius ... ) may be specified in either absolute pixels or relative to the window size. This makes your chart layout-independent since such values are being recalculated automatically when the window dimensions have changed.
Flexible Layout:
- Legends may be centered at a chart edge or in a corner with the chart making way in vertical and/or in horizontal direction thus offering 16 legend/chart relationships to choose from
- Header and footer texts have special font type/size and color settings
Axes and Data:
- Automatical ordinate axis computation based on highest/lowest data value which can be easily replaced by programmer-defined start, end and delta value settings.
- Abscissa labels may be taken either from data cells containing the respective strings or from programmer-defined QStringLists or calculated automatically based on a format chosen by the user and values found in the cells
- Up to 8 axes: 2 left, 2 right, 2 top, 2 bottom
- A chart may have 2 different ordinates: e.g. left axis for series 1,2,3 right axis for data series 4
- Each axis may draw (sub-)grid lines using their own color, line width, style
Chart Combinations:
- sharing the same abscissa axis or using different ones (e.g Top and Bottom axis)
- sharing the same ordinate or using different ones (e.g Left and Right axis)
- Axes may use the same line color / line width as the bars (or the lines, resp.) which they belong to.
Chart Types:
- Bar: normal | stacked | percent, 2D | 3D-Look
- Line: normal | stacked | percent, 2D | 3D-Look, show marker: circle | square | diamond
- Area: normal | stacked | percent
- HiLo: normal | open-close
- Pie: normal | exploded | some exploded, 2D | 3D
- Ring: normal | exploded | some exploded, fixed thickness | relative thickness
- Polar: normal | stacked | percent

Scriptio project is an open source framework for presenting animations and educational content in a rich online experience.
Featuring an easy-to-learn scripting language for fast prototyping and production-quality development, Scriptio is designed for rich Web 2.0 applications.
Scriptio is written in JavaScript, and exploits Ajax techniques. Ajax refers to tools and methods for creating interactive web applications. If accompanying narration or sound is needed, interfaces to Flash, QuickTime, and standard audio formats are supported.
Main features:
Intuitive scripting language
- The scripting language is a simple and easy to understand. It can also be extended since it is built in JavaScript.
Rich object set
- Text, images, rectangles, lines, and circles are supported. Input controls such as buttons, text entry fields, radio buttons, and checkboxes are used for created highly-interactive instructional presentations.
Multiple audio options
- If you need a music or narration soundtrack, interfaces for QuickTime and Flash are included. A Java applet that supports audio formats of Ogg, AU, and WAV has also been developed.
Authoring Tools
- An "author mode" gives valuable feedback as you work and develop your scripts.