The best alternatives to Lucidchart are UXFlow, Mark, and Diagrams for Mac. If these 3 options don't work for you, we've listed a few more alternatives below.
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User flow kit for Sketch and Figma. It helps creating sitemaps really fast and easy for your team/freelance/agency or side projects. Simply drag & drop elements, add arrows, scale their width and height to get professional and beautiful sitemaps, wireframes or diagrams within minutes.
Diagrams is a brand new diagramming app for Mac that brings your structures and processes to life. Create flowcharts, software architecture diagrams, and other structured diagrams to build better understanding through visualization.
Web Sequence is a Chrome extension that saves your time and helps you avoid common mistakes when drawing sequence diagrams. You don't need to drag and drop or resize. Just type in your code (a DSL but like Java and C#) and a diagram is generated for you. Just added HTTPS support. If you are experience issues, please leave comments.