Yes, both ArcGIS Online and ArcGIS Instant Apps offer a Free Trial.
ArcGIS Online is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
ArcGIS Instant Apps is designed for Large Enterprises, Medium Business and Small Business.
Pricing details for both ArcGIS Online and ArcGIS Instant Apps are unavailable at this time. Contact the respective providers for more information.
Some top alternatives to ArcGIS Online includes CARTO, eSpatial, Maptitude, vMAP, Esri ArcGIS, 21stCenturyGIS, 3-GIS, Agile GIS and Geoconcept GIS.
Some top alternatives to ArcGIS Instant Apps includes eSpatial, ArcGIS Online, Map Business Online, vMAP, 3-GIS, Agile GIS, Mapify, Geoconcept GIS and ArcGIS Web AppBuilder.