Ask HN: US-based non-enterprise programming conferences?

What are some US-based conferences for people interested in software or computer science? - not focused on enterprise and big business (at least not as a primary focus) - mostly focused on topics in software, computer science, and programming languages (and not computer hardware, hardware makers/hackers, and so on) - preferably with a strong component of bringing people together in person to share some kind of passion, project, or personal interest Suggestions?