Libre office draw is wonderful, it can edit pdf docs at ease. It’s crazly powerful compared to paint 3d
Based on our record, Wireflow seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Wireflow is a design tool that focus on creating wireframe and user flow. - Source: dev.to / over 1 year ago
Also not used it but have heard good things about https://wireflow.co/. Source: almost 3 years ago
Pencil Project - Single-user mockup / wireframing / diagramming tool
draw.io - Online diagramming application
Zen Flowchart - The simplest tool to create flowcharts
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.