This document discusses potential PhD project topics related to the Contiki operating system. It lists several ideas for projects involving algorithms for UDP flooding attacks mitigation, Big Data delivery, Cooja simulator protocols, and lightweight middleware adaptation in Contiki. Other topic areas mentioned include intrusion detection for RPL wormholes, modern zones in Contiki, traffic control, 6TiSCH, and MAC protocols. Further potential projects involve self-healing algorithms for wireless sensor networks, software-defined 6LoWPAN implementation, and interoperable IP protocols for smart irrigation systems. Overall, the document outlines many computer science research areas and ideas for PhD work involving the Contiki operating system.