FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
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.
LinkChecker - LinkChecker is a free, GPL licensed website validator.
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks