Yes, both Addmin and Content Central offer a Free Trial.
Addmin is designed for Freelancers and Small Business.
Content Central is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Addmin Starts at $4.90/Month when Billed Yearly whereas for Content Central Starts at $35/User/Month.
Some top alternatives to Addmin includes PandaDoc, M-Files, PaperSave, Docsvault, Content Central, Cabinet EDMS, docMgt, EZ Doc Filer, docEdge DMS, Docsmore and DocuWork.
Some top alternatives to Content Central includes PandaDoc, M-Files, PaperNIC, DocuWare, CDOC, Greenbox, docMgt, EZ Doc Filer, Addmin, docEdge DMS and Docsmore.