For Postscript translations of the Velthuis MF files for Devanagari, with
implementations for LaTeX and for Omega/Lambda, see
http://sarovar.org/projects/devanagari/
See
http://sarovar.org/projects/malayalam/
http://sarovar.org/projects/kannadatex/
for Malayalam Linux and TeX, and for Kannada TeX.
Best,
Dominik