Had a look at Charis SIL

[Vasile Gaburici]

It looks like MS disagreed with Adobe on how to standardize the
human-readable form of OpenType features. They have their own
XML-based language, which is used by their VOLT tool. (You can
download VOLT for free, but you have to be a member of their MSN
group.)

What's more interesting (for us) is that SIL has a command line tool,
volt2ttf, that can add OpenType features written in VOLT's XML format
to a TTF file. Sadly, I think that FontForge only groks Adobe's (fea)
feature format, but not not MS VOLT's XML format.

Quote from the SIL web page that Nicolas S. linked:

volt2ttf [-a attach.xml] [-t volt.txt] infile.ttf outfile.ttf
Compiles volt source into OT tables in the font. Think of this as a
3rd party command-line version of MS VOLT.

On Fri, Jul 25, 2008 at 12:07 PM, Nicolas Spalinger
<nicolas_spalinger at sil.org> wrote:
> Dave Crossland wrote:
>>
>> 2008/7/24 Vasile Gaburici <vgaburici at gmail.com>:
>>>
>>> Does anyone know if they
>>> have their own production tools?
>>
>> They do, and they depend somewhat on proprietary software (FontLab)
>> but SIL have been slowly publishing them, I think.
>
> Yes, the SIL designers and script engineers intend to publish more of the
> various tools used in the font production workflow (but it takes time and
> effort!). For example http://scripts.sil.org/FontUtils
>
> Victor Gaultney may cover this aspect during his talk at the next AtypI
> conference:
> http://atypi.org/05_Petersburg/20_main_program/view_presentation_html?presentid=465
>
> Cheers,
>
> --
> Nicolas
>
>
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