Developer Ed Maste is requesting information from those who are users of libvgl. Check his message below and see if you can help out.

Prompted by a recent discussion of the vt(4) console I would like to
send this query to -stable. When posted to -current about 1.5 years
ago it received only one private reply pointing out an example vgl(3)
consumer. Please see the original request and let me know if you use
vgl(3).

On 27 October 2014 at 11:26, Ed Maste <emaste at freebsd.org> wrote:
> vgl(3) is a graphics library for syscons(4) that provides some basic
> graphics operations (e.g. some mode setting, bitmaps, boxes,
> ellipses). Right now it does not support the newer vt(4) console.
>
> In order to help determine the priority of a porting effort to add
> vt(4) support I'd like to better understand where vgl is being used
> now. I'd be interested in hearing about both open source software
> using vgl as well as proprietary or internal applications. So if
> you're using vgl I'd appreciate a follow up (in private is fine) with
> a brief description of your use case.

Original message: https://lists.freebsd.org/pipermail/freebsd-stable/2016-June/084843.html

Related:

FreeBSD VGL provides a library for accessing graphics modes and carrying out basic drawing operations atop its syscons console driver. Not only is basic graphics output on a virtual console supported by libvgl, but mouse input is too handled. However, not many people seem to be using this library.

Phoronix – FreeBSD Is Trying To Figure Out If Anyone Uses Its VGL Graphics Library

Phoronix discussion – FreeBSD Is Trying To Figure Out If Anyone Uses Its VGL Graphics Library