StupidZombie is a tool that can be used to "ping" several directories to notify then about a blog update. It does not need to be run from a Web page like Blogger or Wordpress. You can run StupidZombie from a cron job or using Java WebStart. Also, StupidZombie has a simple tag generator from directories that support it.
Host Status Monitor App is a program that allows you to automatically monitor multiple Internet hosts for downtime. It runs from command line or GUI and can visually indicate host status or email you when a machine goes down. Configuration is performed through two files: a program configuration file (hoststatsmonitor.conf), and a list of hosts to be monitored (hostlist.txt).
pingspray is a tool that generates network traffic for EMC (electromagnetic compatibility) tests. It can generate both random and periodic patterns of data as suggested in some EMC standards. It uses ICMP echo requests (ping) to generate traffic, and when it works as intended, it will generate traffic in both directions.