Maxima is a symbolic computation program. It is full featured, doing symbolic manipulation of polynomials, matrices, rational functions, integration, Todd-coxeter, graphing, bigfloats. Maxima has a symbolic debugger source level debugger for maxima code. A new version, 5.21.1 stable, has been released. Some changes;

QtiPlot is a program for two- and three-dimensional graphical presentation of data sets and for data analysis. The plots can be produced from data sets stored in tables or from analytical functions. It can be successfully used for teaching as well as for complex data analysis and visualisation and is being used in companies, high schools, universities and reseach institutes all over the world. QtiPlot in this new release adds new features, improvement and bug fixes, e.g.;

• Highly improves the import of Origin project files: all versions starting with 6.0 are now fully supported;
• New analysis tools for 2D plot curves were added;
• A new extract worksheet data dialog was added, allowing users to easily filter table values;
• The ASCII import dialog was improved and it is now possible to specify the type of data to be imported;
• Automatic axis labelling was enabled for 2D plots;
• Importation of Excel spreadsheets with date/time cells was improved;
• The 2D plot dialog and the arrange layers dialog were improved.

Here the complete list of changes.

FidoCadJ is a free and open source, multiplatform drawing program dedicated to electronics. Schematics and PCB can be easily traced and represented by a very compact text format, easy to embed in a newsgroup post. Drawings can be exported in a multitude of graphic formats, included pdf. Version fidocadj04212010 (work in progress for 0.23.3 gamma version) of FidoCadJ is out. Here are the new features and improvements:

The Scilab Consortium announces the release of the Scilab 5.2.2 stable version. Scilab is a numerical computational package developed since 1990 by researchers from the INRIA (Institut National de Recherche en Informatique et Automatique) and the École nationale des ponts et chaussées (ENPC). This new release includes many bugs fixes and new functionalities requested by Scilab users, e.g.;

• Resizing the graphics window after having plotted several 2D curves and a legend caused the disappearance of some of them;
• Adding a new color to the current colormap caused the legend entity's default background color to change;
• A text in a graphic containing a "<" symbol could not be exported in eps (fixed);
• "caption" function did not handle properly polylines handles (fixed);
• Loading a saved axis graphics entity did not correctly restore its tics_direction property (fixed).

For more details, consult the main changes between versions 5.2.1 and 5.2.2 of Scilab in this pdf document.

GspiceUI provides a GUI (Graphical User Interface) for two freely available SPICE electronic circuit simulation engines: GNUCap and NGSpice. The following is an extract from the ChangeLog file associated (or release-notes-v0.9.99.txt file) with this new release of GspiceUI;