FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
Heurix.io - Heurix is a free heuristic evaluation tool that helps you work out how to improve your website.
A1 Sitemap Generator - A1 Sitemap Generator has been in active development and sold since 2005.
Heurio - Do website reviews faster. Heurio eliminates the administration process and lets you focus on creating value in a collaborative and user-friendly way. Perfect for heuristic evaluation, design and development review, bug report, QA testing and more.
Octopus.do - Build your website structure in real-time and rapidly share it to collaborate with your team or clients. Start prototyping websites or apps instantly.
UX Companion - A handy glossary of UX theories, tools and principles (iOS)