Thanks for the responses everyone.
I took a look at TechOmaha.com. It's great to see most (if not all?) tech groups in the area curated in one place.
I want to emphasize that what I'm looking for is something where people get together to work on FLOSS projects in particular. I noticed that there's a Ruby and Open Source group. I also noticed that it's the only group that says anything about open source. I'm interesting in doing something agnostic of the technology stack. It just depends on the existing stack used in a project that people are interested in working on. Even if someone starts their own project, I would hope they would use what they believe is the right tool for the job.
I might take a crack at starting my own group for this purpose, if I can generate interest. I have taken the liberty of registering #OmahaNebraskaFLOSS on the freenode IRC network, if anyone wants to discuss this in great depth. I think I may attend the side projects club in the meantime. It's not exactly what I'm looking for, but it's a good start.
Thank you for the welcome. I actually lived in Omaha before, just moving back.
Ben