CFP generates call flows from XML descriptions of the callflow nodes and the flows. The initial version is a proof of concept, based on http://callplot.sourceforge.net/ (thanks to Eric McMurry, a creator of the aforementioned, who also happens to be a colleague), but using XML input. Also, my primary aim was to generate call flows that can be used on a Windows platform (generating a PNG file, for instance). I am also adding support for a number of other features, namely design templates, reading directly from a PCAP file, generating clickable SVGs,  etc.