Yes, both Framer X and Mockplus offer a Free Trial.
Framer X is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Mockplus is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Framer X Starts at $27/User/Month when Billed Yearly whereas for Mockplus Starts at $5.95/User/Month when Billed Yearly.
Some top alternatives to Framer X includes Looka, InVision, Justinmind, Figma, HotGloo, Axure RP, Mockplus, Inspireframe, Previewed and Marvel.
Some top alternatives to Mockplus includes Miro, Adobe XD, NinjaMock, Balsamiq, Axure RP, Wireframe.cc, Claritee, Stage, Previewed and Zen Wireframe.