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 latest maintenance release of UDUNITS is version (unknown).
The beta-test release of UDUNITS is version (version):