Choice of Games is seeking more authors, especially authors with previous experience writing for interactivity. They pay royalties of 25% or, in some cases, work-for-hire fees amounting to $10K.
Fungus is a recently-announced free Unity plugin for building interactive fiction. As far as I can tell it’s aiming for something closer to Ren’Py or
AGT AGS than text-based IF experiences, but I haven’t had time to actually play with it yet.