LabVIEW - LabVIEW offers many of the functions you'd find in a traditional script-based programming language presented in a more intuitive visual interface ideal fo engineering.
myOpenLab - MyOpenLab is a platform for finished elements (program components) that can be linked together.
PyLab_Works - PyLab_Works is a free and open source replacement for LabView + MatLab, written in pure Python.
itom - itom is an open source software suite for operating measurement systems, laboratory automation and...
FlowStone - FlowStone - the new graphical computer programming tool that allows you to create your own standalone programs quicker and more easily than ever before, download for FREE!
proteus VSM - A virtual simulation environment for electronic circuits with support of digital and analog devices.