Yes, both KiSSFLOW and Trello offer a Free Trial.
KiSSFLOW is designed for Large Enterprises, Medium Business and Small Business.
Trello is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for KiSSFLOW Starts at $9.90/User/Month when Billed Yearly whereas for Trello Starts at $5/User/Month when Billed Yearly.
Some top alternatives to KiSSFLOW includes GoodFlow, VisionFlow, Zoho Flow, ProcessMaker, Pipefy, K2, Flowingly, BPMapp by 500apps, Kissflow Procurement Cloud and Cflow.
Some top alternatives to Trello includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Freshbooks, Jira, Basecamp, Wrike, monday.com, Asana, Teamwork, ProjectManager.com, Microsoft Project, Worksuite, Trackboard, Quick Base, Todoist, Resource Guru and Height.