Yes, both Adobe XD and Mockplus offer a Free Trial.
Adobe XD is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Mockplus is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Adobe XD Starts at $9.99/Month whereas for Mockplus Starts at $5.95/User/Month when Billed Yearly.
Some top alternatives to Adobe XD includes Figma, FigJam, InVision, UXPin, UX-App, Justinmind, UserX, MockupTiger, Sketch and FlowMapp.
Some top alternatives to Mockplus includes Miro, Adobe XD, NinjaMock, Balsamiq, Axure RP, Wireframe.cc, Claritee, Stage, Previewed and Zen Wireframe.