They went to the park.
I went with them.
They brought their frisbee.
At least I think it was theirs.
They threw the frisbee to themselves.
Full usage: https://pronoun.gdn/subject-pronoun/object-pronoun/possessive-determiner/possessive-pronoun/reflexive displays examples of your pronouns.
this is a bit unwieldy. if we have a good guess we'll let you use just the first one or two.
you can also pass any number of aditional pronouns in "or" arguments like so: https://pronoun.gdn/he?or=she&or=they/.../themselves
written (initially) in a couple of hours in a single PHP file by maple "mavica" syrup, whose pronouns are byte or it. i wanted to see if i could do it.
thanks and sorry to @morganastra, whose pronouns are ze or she, for the now defunct pronoun island, which i've completely ripped off.
pronoun.gdn is jank and open source under a modified beerware license
PHP-CGI is still cool <3