Text-based distributed monitoring

Is there any text-based, ideally distributed monitoring software out there? I want a TUI that shows me (e.g. with green/red highlights) the reachability of hosts (simple ping checks) while I'm doing network maintenance. Like a really simple, curses based nagios? It would probably look like a bloomberg terminal.. (I know this wouldn't be too hard to implement.. but I can't believe it's not already out there...)