Yes, both Content Central and Diffchecker offer a Free Trial.
Content Central is designed for Large Enterprises, Medium Business and Small Business.
Diffchecker is designed for Individuals, Medium Business and Small Business.
Pricing for Content Central Starts at $35/User/Month whereas for Diffchecker Starts at $49One Time Payment.
Some top alternatives to Content Central includes PandaDoc, M-Files, PaperNIC, DocuWare, CDOC, Greenbox, docMgt, EZ Doc Filer, Addmin, docEdge DMS and Docsmore.
Some top alternatives to Diffchecker includes Draftable, DeltaDoc, DocSavy, Qualified, What The Diff, Workvivo, Version Story, CodeSee, Slick, DeftPDF, ui-diff and IFTTT.