FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
A1 Sitemap Generator - A1 Sitemap Generator has been in active development and sold since 2005.
HelpSpace - The team inbox with super powers
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.
Drift - A messaging app that helps you grow your business.