Actual Storage calculates the actual storage capacity of secondary storage mediums, such as hard drives, CDs/DVDs, and USB drives. It can handle units from KB (1000 bytes in the decimal system) to YB (1000^8 bytes in the decimal system).
RMD Calculator calculates the Required Minimum Distribution (aka. Minimum Required Distribution or RMD) for people between the ages of 70-115+. This is most useful for US residents.
An easy to use, but still quite capable firewall for Netfilter/iptables.
A graphical editor for ISO images.