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.
avrLab is an IDE (integrated development environment) for AVR microcontroller from ATMEL. It includes an editor with syntax highlighting. avrLab includes support for macro assembler (tavrasm and avra) as well as support for accessing the AVR via uisp.