Yes, both Alteryx and Microsoft Power BI offer a Free Trial.
Alteryx is designed for Large Enterprises and Medium Business.
Microsoft Power BI is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Alteryx Starts at $5,195/User/Year whereas for Microsoft Power BI Starts at $4,995/Month.
Some top alternatives to Alteryx includes iDashboards, DataHero, Corporater Business Management Platform, Databox, DB Dash, Microsoft Power BI, Dundas BI, myDATA3, Tableau Server and Dasheet.
Some top alternatives to Microsoft Power BI includes Google Drive, Tableau, IBM Cognos Analytics, Dundas BI, SAS Business Intelligence, Clear Analytics, SAP BusinessObjects BI, ibi Analytics Platform, Narrative BI and Microsoft Power BI Desktop.