Radically different, no, but I use blockdiag and its variations now (netdiag, seqdiag, etc) for automation of text based diagram generation. I still occasional

Radically different, no, but I use blockdiag and its variations now (netdiag, seqdiag, etc) for automation of text based diagram generation. I still occasionally use graphviz and plantuml, but they aren't that different. I've played with but not really used the only two that you might consider radically different, yEd and Gephi. Originally what spurred me towards text based diagram generation was a visceral hatred for out of date visio network maps, so I wrote a script to automatically update network maps and diffarchive old ones so I could walk back in time on the network. It was something that could be put in a report and look nice (due to manual layout control) vs the automap generation of things like LibreNMS/Zabbix/Nagios.