# Time conversion - convert between Unix timestamp, ISO8601 and RFC 2822 formats
# String conversion - encode/decode Base64-encoding; escape XML, URL's and ECMAScript; translate to UTF-8
# Number conversion - convert between decimal, hexadecimal, octal and binary numbers
# Network - calculate netmasks, broadcast addresses and do DNS lookups
# Bandwidth - calculate the duration of file transfer
# XPath debugger - test your XPath expressions