Here are a few:
- Structure Core: https://structure.io/structure-core Closest to RealSense in functionality that I've tried so far, but pricier. Software is in a private developer portal instead of a Git repo where everyone can submit issues and pull requests and comment, so it's not as easy to get help as RealSense when you run into issues.
- Mynt Eye: https://www.mynteye.com/ From my understanding the S models eat into your GPU and the D models have on-board processing, but the D models seem sold out.
- ZED: https://www.stereolabs.com/zed/ They eat into your GPU. No on-board processing.
I'd be very interested to know about others, especially if there are more that can do on-board processing, since I typically need my entire GPU for other tasks.