From its home page (see below):

<blockquote>
The Contiki desktop environment is a highly portable, modern, open source, Internet-enabled *(OS) and desktop environment for very constrained systems, such as 8-bit homecomputers like the Commodore 64.
</blockquote>

Internet-enabled means a web browser (in 9 kilobytes and 4 kilobytes of RAM required) and an e-mail client.

This _(OS) is form Adam Dunkels, the same author of &mu;IP.

<ul class="implementations">
<li>_("Contiki home page"|http://dunkels.com/adam/contiki/).
<li>_(&mu;IP|http://dunkels.com/adam/uip/) - A Free Small TCP/IP Implementation for 8- and 16-bit Microcontrollers.
</ul>

