Geohex-perl is a project mainly written in Perl, it's free.
geohex perl implementation (Geo::Hex)
Geo-Hex
Convert between latitude/longitude and GeoHex code
INSTALLATION
To install this module, run the following commands:
perl Makefile.PL
make
make test
make install
Alternatively, to install with Module::Build, you can use the following commands:
perl Build.PL
./Build
./Build test
./Build install
DEPENDENCIES
Exporter POSIX Math::Round
COPYRIGHT AND LICENCE
Copyright (C) 2009, OHTSUKA Ko-hei
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.