Quill, which is a VR software for artists and creators, is free currently on Oculus. The software is in early access.
Description:
Quill is the VR illustration and animation tool built to empower artists and creators, whether to create final art or as a production tool for concept creation aid. It is designed to be intuitive to artists. It’s expressive, efficient and comfortable to use over a long period of time.
Quill allows users to paint and animate in virtual reality on an infinitely scalable canvas, with rich colours and intuitive tools. Quill is designed to be expressive and precise and to let the artist’s “hand” come through clearly – whether that’s in a watercolour style, pencil style, oil painting style or something else.
Link:
No expiry date given. Also no indication whether it’s perma-free or not.