Yes, both EDraw Max and Mermaid Chart offer a Free Trial.
EDraw Max is designed for and Small Business.
Mermaid Chart is designed for and undefined.
Pricing for EDraw Max Starts at $99/Year whereas for Mermaid Chart Starts at $80.00per user / year when Billed Yearly.
Some top alternatives to EDraw Max includes Miro, FigJam, MindManager, SmartDraw, Gliffy, Microsoft Visio, Creately, Lucidchart, DrawSQL, Quick Diagram, diagrams.net and yEd Graph Editor.
Some top alternatives to Mermaid Chart includes and undefined.