UX Map is a widget library to document user journeys and human-computer interactions using a simple visual language. It also allows to add interactive annotations to your Axure prototype, that expand contextually on mouseover, and can be toggled on and off globally.
Scheme Flowcharts is a huge pack of layouts for UX prototyping. This toolkit consist 310+ flowcharts in 9 categories for Mobile & Web. All flowcharts carefully crafted and easy to customize. You can use Sketch Symbols and Styles for speed up your workflow.