I would like to find a small, simple Tulsa to design software. In General, the design even loudly. It would be easy to find a replacement for eternal and reliable, but outdated tools: paper A4 with pen. But to no frills. No standards, UML and other don't. Or at least, not to complicate the work. Just painted about a scheme of work, saved, and everything is ready. Not to be soared with a choice of suitable figures for the scheme, etc. For myself, well a maximum of 2-3 colleagues who will understand you.
Worked with Enterprise Architect(like correctly wrote) — just a corporate monster. Tried the dia — is not it. In block diagrams to draw is not desirable, the interface kills clumsiness. Heard about visio, but have not tried.
What would you recommend? Who than uses?