wmCalendar is a calendar dockapp with a monthly view and an interface to iCal-based calendars like Evolution or Mozilla. It features Gregorian, Persian, and Islamic calendar support, moon phases, variable start of the week, popup detail info about a day's events, and app.launcher.
wmJupiter is a Window Maker applet which features the planet Jupiter. It allows you to keep track of the Great Red Spot and the current distance in astronomical units (AE). The four Gallileo moons (Io, Europa, Ganymede, and Calisto) are also displayed when they are near the planet.