> I checked new snowball site http://snowballstem.org/ and found several new
> stemmers appeared (as external contributions):
>
> Irish and Czech
> Object Pascal codegenerator for Snowball
> Two stemmers for Romanian
> Hungarian
> Turkish
> Armenian
> Basque (Euskera)
> Catalan
>
> Some of them we don't have in our list of default configurations. Since
> these are external, not official stemmers, it'd be nice if people look and
> test them. If they are fine, we can prepare new configurations for 9.6.
We have configurations for the ones included to the Snowball, namely
Romanian, Hungarian, and Turkish. I don't know why the others are not
included but listed on the page as external contributions. It might
be a good idea to wait for someone to commit them to the upstream.
I have checked the changes on the algorithms [1]. They don't seemed
to be updated much after 2007, but recently a new one for Tamil
language is added. It might be a good candidate for a new
configuration.
[1] https://github.com/snowballstem/snowball/commits/master/algorithms