Yes, both Gliffy and StoriesOnBoard offer a Free Trial.
Gliffy is designed for Large Enterprises, Medium Business and Small Business.
StoriesOnBoard is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Gliffy Starts at $8/Month when Billed Yearly whereas for StoriesOnBoard Starts at $9/user/month when yearly.
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 StoriesOnBoard includes Todoist, Aha!, Jira, productboard, Productroad, Next Please, Wrike, Smartsheet, ClickUp, FeatureMap, Height, Featmap and Avion.