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.
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.