GNU gettext - Table of contents linking to manual pages. - http://www.gnu.org/software/gettext/manual/gettext.html
Linux Internationalisation Initiative - An effort to make it easier for Linux application programmers to support all the world's languages - http://www.openi18n.org/
Linux localization project for India - This is the home page of a project that attempts to localize linux for India, work includes Indianisation and translation to Hindi and other Indian languages. The project is hosted on sourceforge.net - http://indlinux.org