Not sure if I've announced this here before, but I've created an #xtUML chat room in matrix, #xtuml:matrix.org.

Feel free to come by and discuss events and issues in your use of Shlaer-Mellor / xtUML for software development, or ask questions concerning what it's all about or how to use it.

Also visit https://xtuml.org to get documentation/training and download the FOSS xtUML tool, #BridgePoint.