Holtek Semiconductor Inc.
It enables the e-Link32 to be used with the µVision4 / µVision5 IDE.
It integrates the genuine ARM C/C++ Compiler into Atmel Studio.
The µVision IDE from Keil combines project management, make facilities.
Silicon Laboratories Inc.
It provides a complete host and device solution for microcontroller devices.
CodeMaster enables three levels of integration with third parties' compilers.
It is a free plugin which allows you to easily debug your project.