Yes, both OmniFocus and Asana offer a Free Trial.
OmniFocus is designed for Large Enterprises, Medium Business and Small Business.
Asana is designed for Large Enterprises, Medium Business and Small Business.
Pricing for OmniFocus Starts at $9.99/Month whereas for Asana Starts at $6.92/user/month when monthly.
Some top alternatives to OmniFocus includes Todoist, Wrike, Smartsheet, Asana, ProWorkflow, nTask, Taskworld, TickTick, Today, MeisterTask, ClickUp and StickyList.
Some top alternatives to Asana includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Jira, Basecamp, Trello, Wrike, ProofHub, monday.com, Teamwork, ProjectManager.com, Microsoft Project, Quick Base and Height.