wmsupermon is a universal monitoring dockapp. It can be used to monitor CPU usage, disk I/O, memory usage, swap, filesystems, space utilization, network traffic, wireless link quality, CPU frequency, CPU temperature, fan speed, voltages (without requiring lm_sensors), battery status (with actual, not "reported", discharge rate), traffic from your router, or anything else. It can open and maintain many dockapp windows with one dockapp process.
astime is an analogue clock for X windows. It shows the current time, the date and the day of the week. astime should run anywhere on Unix-like systems in principle but was so far tested on Linux, FreeBSD and Solaris only. The command-line options allow to customize colors of every element of the display.