The UDUNITS package supports units of physical quantities. Its C library provides for arithmetic manipulation of units and for conversion of numeric values between compatible units. The package contains an extensive unit database, which is in XML format and user-extendable. The package also contains a command-line utility for investigating units and converting values.
This is the latest stable release of UDUNITS is (unknown).
This is the legacy release of UDUNITS is version (unknown).
The beta-test release of UDUNITS is version (version):