PDF viewer for "editable" PDFs

[Alexander Yerenkow]

Of course, it's pretty offtopic, but in my knowing there's no other office
format allowing to send to someone some form to fill. Read-only form. With
"required" fields.
Not everyone in this world stuck with console and some vim or even cat &&
echo :)
There was PDF, which was pretty read-only (for most users), so Abobo
decided to create fillable versions.
So you can blame software giant, format, but this side of usage is not
useless.

-- 
Regards,
Alexander Yerenkow