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.
A message transfer agent.
A simple DDNS client