Yes, both OmniFocus and ProWorkflow offer a Free Trial.
OmniFocus is designed for Large Enterprises, Medium Business and Small Business.
ProWorkflow is designed for Large Enterprises, Medium Business and Small Business.
Pricing for OmniFocus Starts at $9.99/Month whereas for ProWorkflow Starts at $9/User/Month when Billed Yearly.
Some top alternatives to OmniFocus includes Todoist, Wrike, Smartsheet, Asana, ProWorkflow, nTask, Taskworld, TickTick, Today, MeisterTask, ClickUp and StickyList.
Some top alternatives to ProWorkflow includes monday.com, Quickbase , Smartsheet, ClickUp, Zoho Projects, Wrike, TeamGantt, Asana, Teamwork, ProjectManager.com, WorkflowMax, ProProfs Project, Projectworks, Taskworld, WirTask, Quick Base and Flow.