FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
Interfacer - Collection of more than 200+ free design resources
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.
Facebook Design Resources - A collection of free resources made by designers at Facebook
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Freebiesbug - Collection of the best free web design resources.