I plan to release jNetMap version 0.5 some when in February 2011.
It’s going quite well so far; the ICMP-Ping problem has been addressed, the UI has received a major facelift, multi-language support is working, a “notification system” will be added and I hope that we’ll be able to support basic plugins.
I also intend to add “ping-agents”, i.e. small scripts that can be written in any language and run on a machine in a remote subnet, which will check and report the status of those remote machines. This should improve the “visibility” of subnets and also reduce “ping noise” across the network.