Free drawing software for Windows, Mac OS X, and Linux
Dia Diagram Editor is free Open Source drawing software for Windows, Mac OS X and Linux. Dia supports more than 30 different diagram types like flowcharts, network diagrams, database models. More than a thousand readymade objects help to draw professional diagrams. Dia can read and write a number of different raster and vector image formats. Software developers and database specialists can use Dia as a CASE tool to generate code skeletons from their drawings. Dia can be scripted and extended using Python.
Cross platform GUI for Maxima
wxMaxima is a cross-platform graphical front-end for the computer algebra system Maxima based on wxWidgets. It provides nice display of mathematical output and easy access to Maxima functions through menus and dialogs.
Clothes - sewing CAD for creation of models of clothes. Based on the new concept of the automated designing of clothes with use of parametrical model. Creates a base design of model of clothes and allows to change it depending on necessity of updating.
Mathcad - engineering calculation solution, is used by engineers and scientists in various disciplines: mechanical, electrical, and civil engineering. Mathcad today includes some of the capabilities of a computer algebra system, oriented towards ease of use and simultaneous documentation of numerical engineering applications. Mathcad is computer software primarily intended for the verification, validation, documentation and re-use of engineering calculations.
Openwindow - program for constructing and calculating the PVC windows and doors
osLib Manager - Library Manager for the OpenSCADA system. It allows you to add/delete widgets from the OpenSCADA library project quickly and easily. Written in Java, uses a license GPL version 3