Does it have to be a type1 font?
If type42 is OK, I'd use DejaVu Mono from:
http://dejavu.sourceforge.net
(and also included in nearly every Linux or BSD dist).
Since the fontforge src is included, you can use fontforge to generate
type1 or cff files for Deja, too.
Deja's is based on Bitstream Vera. The changes from Vera are explicity
released to the public domain.
The same deal applies (except the origin and license) for
Liberation Mono from:
https://fedorahosted.org/liberation-fonts
Liberation is released under Sil's OFL-1.1.
-JimC
--
James Cloos <
cl...@jhcloos.com> OpenPGP: 1024D/ED7DAEA6