Are there any programs that can open up Microsoft Visio .vsd files?
NO diagram program in the entire world does; the MS format is private, undocumented, and darn hard to crack — Omnigraffle will open Visio files if they were saved as .XML — same for the app ConceptDraw — the only problem is that PC users save their Visio files as .vsd — so the short answer is: there is NO Mac program that opens .vsd files directly.