Sage is an open source mathematics computing environment (MCE) which covers many aspects of mathematics, e.g. algebra, calculus, elementary to very advanced number theory, cryptography, numerical computation, group theory and so on. Sage 4.5.2 has been released. In this version a total of 375 new functions were added since version 4.5.1 then the total number of functions is now at 26139 (overall weighted coverage score: 83.8%). Some changes in this release are:

• Change ring broken over QQ and GF(2);
• Improve TAB-completion in Macaulay2;
• Improve robustness of @parallel;
• Fix atan2() conversions between Sage and SymPy;
• Add a class for factor-enumerable words;
• Added eigenvalues, eigenvector, eigenspaces and minpoly to vector space endomorphisms.

Sage 4.5.2 closed 159 tickets, all of which are available here for your reading pleasure.

EMC-EMC2 (Enhanced Machine Control - version 2) is a software that implements real-time control, but the Enhanced Machine Controller is a lot more than just another CNC machine (Computer Numerical Control) mill program; it can control machine tools, robots, or other automated devices. Changes since 2.4.1 of EMC2 are:

The aim of port GmbH is the development of progressive, high-quality products and engineering services in the area of industrial communications especially for CAN, CANopen, DeviceNet and (Realtime) Ethernet and Ethernet POWERLINK respectively. Products for field busses and Industrial Ethernet customized client-specific fieldbus-oriented solutions too, reliable industrial protocol stacks, professional tools, security and routing for industrial ethernet. It's possible to download and evaluate some tools and driver can4linux. New versions of software and driver hardware has been released:

• CANopen Design Tool (2.2.38 stable): a tool for rapid and cost-saving development of CANopen applications (devices) using our CANopen Library. It administers device databases, from which an object dictionary and an initialization function in C-code, an Electronic Data Sheet and the documentation are produced automatically. Furthermore it simplifies the configuration of the CANopen Library and of the CANopen Driver Packages. Additional/Modified drivers: Luminary LM3S type LM3S5B91 (by Luminary Micro) added (Note: compatibility problems possible when using other Luminary LM3S types) and NEC PD70F3476 added;
• POWERLINK Deisgn Link (1.3.1 stable): a tool for rapid and cost-saving development of POWERLINK applications (devices) using our POWERLINK Library. It administers device databases, from which an object dictionary, an Electronic Data Sheet (XML Format) and the documentation are produced automatically. Furthermore it simplifies the configuration of the POWERLINK Library. New feature: support for DOMAIN description according to Automation Studio;
• can4linux (3.5.6 stable): the universal LINUX CAN device driver can4linux supports a broad range of CAN interfaces. ports AT-CAN-MINI is supported as well as a a bunch of interfaces from other manufacturers. Source code of the software is available. It compiles for Kernels 2.0, 2.2 2.4 and latest 2.6. Some changes: support for a new target, the FlexCAN module in a Freescale imx35 PDK. Correct wrong kernel version compare for syctl struct components and changes in the sysctl interface since kernel version 2.6.33 testet with kernel 2.6.34 (Suse 11.3) removed some new compiler warnings with the latest gcc.

Xenomai is a real-time development framework cooperating with the Linux kernel, in order to provide a pervasive, interface-agnostic, hard real-time support to user-space applications, seamlessly integrated into the GNU/Linux environment. In this new version of Xenomai (2.5.4), here is some of optimizations, cleanups, improvements and bug fixes:

• A lot of improvements for the analogy framework;
• Various bug fixes;
• So called MAYDAY support, which should allow Xenomai watchdog to work less brutally (namely, avoid killing the tasks occupying too much CPU, and send them a signal), and be the base for a new version of user-space signals in the 2.6 branch.

For detailed commit logs, see git shortlog.

GNU Octave is a high-level language, primarily intended for numerical computations. It provides a convenient command line interface for solving linear and nonlinear problems numerically, and for performing other numerical experiments using a language that is mostly compatible with Matlab. A new snapshot of the current development version of Octave is available for ftp (3.3.52). You should only be using this version if you are interested in testing the latest features and don't mind hitting the occasional bug. This new testing version fixes/improvements/adds new features, e.g.:

Fritzing is an open-source initiative that allows you to virtually design electronic circuits on a breadboard (although you could design circuits that aren't on a breadboard). This could save a lot of hours working on a breadboard if you have this amazing software at hand. In this new version of Fritzing a high-level summary of changes are:

• Very experimental (use at your own risk) "speed hack" added to trace menu: speeds up Fritzing when there are a lot (~50 or more) of interconnected parts in a sketch;
• Experimental ratsnest wire functionality: double click to create a trace; drag to create a trace with a bendpoint; delete to delete corresponding wires in other views;
• Jumper items: rotate and align to grid;
• On double-sided boards, right-clicking a trace gives an option to move the trace from one side of the board to the other;
• Bug fixes: a crash bug that occured sometimes on one-sided boards when hand- or auto- routing;
• New parts: LilyPad Arduino and Arduino Pro Mini.

But if you're interested in the detailed changes, take a look at the individual code changes clicking here.