Yes, both Slenke and ClickUp offer a Free Trial.
Slenke is designed for Large Enterprises, Medium Business and Small Business.
ClickUp is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Slenke Starts at $15/User/Month when Billed Yearly whereas for ClickUp Starts at $7/User/Month when yearly.
Some top alternatives to Slenke includes Quickbase , Smartsheet, ClickUp, Wrike, TeamGantt, monday.com, Teamwork, ProjectManager.com, Microsoft Project, ProWorkflow, Projectworks, Trackboard, Quick Base and Project Insight.
Some top alternatives to ClickUp includes Basecamp, Trello, TeamGantt, Asana, Teamwork, ProjectManager.com, ProWorkflow, nTask, Todoist and Height.