Integrated Development Environment for some microcontrollers based on 8051(e.g. AT89S8253). Supported languages are Assembly and C. It has its own simulator, assembler, editor and many other tools. See the project web site for more details and the newest updates.
SigLab is a signal calculator for Scilab. Its goal is to ease the analysis of signal processing simulation results. It allows to view and to manipulate monodimensional signals in a interactive and easy way.