Yes, both Onshape and 4G:PLM offer a Free Trial.
Onshape is designed for and undefined.
4G:PLM is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Onshape Starts at $1,500/User/Year whereas for 4G:PLM Starts at $50/User/Month.
Some top alternatives to Onshape includes Odoo PLM, FusePLM, Arena PLM, Upchain PLM, Propel PLM, Autodesk Fusion Lifecycle PLM, CIM Database PLM, KloudPLM and Trace One PLM.
Some top alternatives to 4G:PLM includes Oracle Agile, Odoo PLM, Propel PLM, Autodesk Fusion Lifecycle PLM, Onshape, YuniquePLM, KloudPLM, SoftExpert PLM and Trace One PLM.