There's a list of languages here [1]. It looks like someone helpfully added maintainers to the table. You could find languages without a listed maintainer there and then check the header of the source file [2] to be sure there's no current maintainer.

[1] https://orgmode.org/worg/org-contrib/babel/languages/index.html
[2] https://code.orgmode.org/bzg/org-mode/src/master/lisp

On Thu, Apr 22, 2021 at 1:14 AM Dr. Arne Babenhauserheide <arne_bab@web.de> wrote:

Timothy <tecosaur@gmail.com> writes:
> As far as I know the only call for help maintaining Org has been with
> babel packages. Otherwise you would have seen me volunteering :P I'd
> like to do more if I get the opportunity.

I’m currently in the process of enabling myself to contribute. Do we
have a list of babel-packages that need maintenance? This is also
something I’m personally interested in, because I use babel a lot,
including in multi-language workflows.

Best wishes,
Arne
--
Unpolitisch sein
heißt politisch sein
ohne es zu merken