Yes, both MergeQueue and Unifize offer a Free Trial.
MergeQueue is designed for Individuals, Medium Business and Small Business.
Unifize is designed for Large Enterprises, Medium Business and Small Business.
Pricing for MergeQueue Starts at $2/User whereas for Unifize Starts at $40/User/Month.
Some top alternatives to MergeQueue includes Actionsflow, Qualified, Workvivo, Mergify, Codebots, ProcurementFlow, Flowall, reshift, TotalCloud, Unifize and IFTTT.
Some top alternatives to Unifize includes Flowist, CollaborateCloud, Genialcloud Facsys, Breakout, Qualified, Workvivo, Flowall, Pascal Workflow, Dashpivot, IFTTT and Consider.