Mozhi is a scheme suggested by cibu who is the creator of the parsor varamozhi.
ACK is the scheme evolved through the newsgroup Alt.Culture.Kerala. For more information on ACK please see the www.kerala.org page
ITRANS is the scheme used in Avinash Chopde's ITRANS package.
Velthuis is the Scheme deviced by Frans J. Velthuis, primarily for Devnagari script and is used in his tool for transliteration of Devnagari.