Embedded tools that
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CodeVisionAVR
Integrated Development Environment for the 8-bit Atmel AVR, AVR8X and XMEGA Microcontrollers
Libraries
Besides the standard C libraries, the CodeVisionAVR compiler features a rich set of libraries designed to fulfil all the needs of the embedded systems programmer.
The CodeVisionAVR libraries are not GPL-ed, therefore you are not obliged to publish the source code of your commercial application or pay us royalties for their commercial usage.
The CodeVisionAVR compiler features a library for the Microchip ENC28J60 Ethernet controller.
The signal allocation for the ENC28J60 chip can be easily set in the project configuration:
Several code examples for the ENC28J60 are supplied with the compiler.

Also are supplied web server examples for other popular chips like W5100 from Wiznet and CP2200 from Silicon labs.