Products of mcu8051ide.sourceforge.net
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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 http://mcu8051ide.sf.net for more details..
Freeware download of MCU 8051 IDE 1.4.3, size