Yes, both OmniFocus and Taskworld offer a Free Trial.
OmniFocus is designed for Large Enterprises, Medium Business and Small Business.
Taskworld is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of OmniFocus begins at $9.99/Month, while pricing details for Taskworld are unavailable.
Some top alternatives to OmniFocus includes Todoist, Wrike, Smartsheet, Asana, ProWorkflow, nTask, Taskworld, TickTick, Today, MeisterTask, ClickUp and StickyList.
Some top alternatives to Taskworld includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Trello, Wrike, TeamGantt, Teamwork, ProjectManager.com, Microsoft Project, ProWorkflow, Trackboard, Quick Base, Today, Height and Project Insight.