Gswitch automatically changes your GNOME desktop background every so often. The backgrounds are displayed randomly. All background images and style settings are sourced from your list of backgrounds as configured in "System > Preferences > Appearance". By default, images are switched after 20 minutes. Although the images are shown randomly, every image will be shown at least once before you see any repeats.
checkcopy is a GUI tool to copy the files and directories to some destination while creating checksums and/or verifying them. It reads all the checksum files, then reads in each file to copy it to the destination. If a checksum is present for the file, it will be verified, otherwise the checksum is written out to disk.
Psensor is a graphical hardware temperature monitor for Linux. It can monitor temperatures of the different hardware sensors (motherboard and CPU using lm-sensors), hard disk drives (hddtemp/libatasmart), and ATI/Nvidia GPUs. The fan can also be monitored (lm-sensors). Psensor is designed to be simple and easy to use.