Contiki is a small, open source, highly portable, multitasking computer operating system developed for use on a number of memory-constrained networked systems ranging from 8-bit computers to embedded systems on microcontrollers, including sensor network motes.

The name Contiki comes from Thor Heyerdahl’s famous Kon-Tiki raft.

The Contiki 2.x contains only very little assembler coding and even less target-specific assembler coding. This allowed for easy porting to targets beside the C64 namely the C128 and Apple II. Porting to other cc65 targets wasn’t done due to missing Ethernet hardware.

Contiki 2.4 is the first 2.x release to contain the following programs:

• Dhcp client.
• Web server.
• Web browser.
• Wget.
• Smtp client.
• IRC client.
• Twitter client.

Beside lots of other improvement especially the following issues were fixed:

• Malfunctioning DNS lookup.
• Missing PETSCII conversion for the smtp credentials.
• Incorrect fixing of all disk I/O to drive 8.

source: lemon64.com wikipedia cbm8bit.com