Yes, both Gliffy and DrawERD offer a Free Trial.
Gliffy is designed for Large Enterprises, Medium Business and Small Business.
DrawERD is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Gliffy Starts at $8/Month when Billed Yearly whereas for DrawERD Starts at $5/Month.
Some top alternatives to Gliffy includes Miro, FigJam, SmartDraw, Cacoo, Microsoft Visio, DrakonHub, Creately, Lucidchart, EDraw Max, DrawSQL, Quick Diagram and diagrams.net.
Some top alternatives to DrawERD includes Miro, FigJam, Gliffy, Microsoft Visio, Creately, QuickDBD, Lucidchart, DrawSQL, AutoCloud, Quick Diagram, diagrams.net and ERD Lab.