Yes, both ReadCube Papers and Sciwheel offer a Free Trial.
ReadCube Papers is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Sciwheel is designed for Individuals, Medium Business and Small Business.
Pricing for ReadCube Papers Starts at $3/Month whereas for Sciwheel Starts at $9.95/Month.
Some top alternatives to ReadCube Papers includes Nimbus Note, Qualified, Workvivo, The Papers, Citavi, Zotero, Paperpile, Sciwheel, EndNote, RefWorks and Weava.
Some top alternatives to Sciwheel includes ScholarOne, Qualified, Workvivo, nXr, JabRef, Citavi, Zotero, Paperpile, EndNote, ReadCube Papers, RefWorks and SciSpace (formerly Typeset).
