Based on your username, you're at US Digital Service? Thanks so much for taking to time to reach out. Glad to see they released a Linux version of the rasUnsteady64 executable! I was able to run the example on WSL! It wasn't there the last time I looked, for sure. There's a lot more to HEC-RAS than that, but it's certainly the most important component.

Mike Bannis has done great work wrapping the HEC-RAS controller and creating parsers some of the file formats. There's a very helpful _unoffcial_ book [1] laying out the win32com control and file format details. Making HEC-RAS open source would allow many more projects like these, with significantly less guesswork.

[1] https://www.kleinschmidtgroup.com/breaking-the-hec-ras-code-...