Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
UX Toolkit for Figma - Create beautiful user flow charts, sitemaps and wireframes
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Landing UI Kit - Handcrafted UI components for landing pages
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.