Yes, both ProcessKit and K2 offer a Free Trial.
ProcessKit is designed for Medium Business and Small Business.
K2 is designed for Large Enterprises, Medium Business and Small Business.
Pricing for ProcessKit Starts at $39/Month when Billed Yearly whereas for K2 Starts at $2,000/Month.
Some top alternatives to ProcessKit includes Process Street, Kriya, Microsoft Azure, ProcessMaker, K2, ProcessPlan, ProcessPolicy.com, Withprocess.com, Skore and Taskbox.
Some top alternatives to K2 includes Nintex, ProcessMaker, BP Logix BPMS, Nintex Promapp, IBM Business Automation Workflow, ProcessPlan, Bautomate, Bizagi, Tibco BPM Enterprise and BPMapp by 500apps.