Temperature.app is a Window Maker applet which fetches local temperature information every 15 minutes from http://weather.noaa.gov and displays it (in Celsius or Fahrenheit).
WMLongRun is a dockapp to monitor LongRun®. It displays the current LongRun settings and status: the frequency, the LongRun flags (performance or economy), and the performance level (expressed as a percentile). It runs on GNU/Linux and FreeBSD.
wmifinfo is a simple applet showing basic network info for all available interfaces. It shows IP address, netmask, gateway and MAC address. A bit like ifconfig. For wireless interfaces a link-level indicator is shown.