Yes, both Parabola and Flatly offer a Free Trial.
Parabola is designed for Medium Business and Small Business.
Flatly is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Parabola Starts at $80/month whereas for Flatly Starts at $19/User/Month.
Some top alternatives to Parabola includes CircleCI, Etlworks Integrator, Matillion ETL, Fivetran, ETL Framework, Datagaps ETL Validator, Etleap, Optimus Mine, ETLrobot and Alloy Automation.
Some top alternatives to Flatly includes Etlworks Integrator, Matillion ETL, Fivetran, Blendo, Panoply, Flex.io, Hevo, Datagaps ETL Validator, Etleap and ETLrobot.