This compilation of case studies aims to provide guidance and inspiration to urban practitioners eager to integrate ICT-based approaches to climate change in their work. Those presented examples that are not directly applicable to managing the consequences of climate change, have been included due to their potential in this sector. The document has a strong focus on open formats and approaches (Open Data , Open Hardware , Free and Open-Source Software , collaborative mapping and crowd-sensing) comprise the majority of this study. The ability to share, modify, use and re-distribute content lies at the heart of constructing useful systems that enable citizens, researchers, governments, and urban practitioners to collaborate towards a more climate resilient future with the use of ICTs. Commercial options are driven by an economically motivated smart-city design. That approach leads to challenges in terms of data ownership, interoperability, transparency and privacy. By contrast, the majority of the presented solutions are free to download, use and run on current Android, iOS smartphones and/or computers.