OpenSign is described as 'Welcome to OpenSign, an open-source document e-signing solution designed to provide a secure, reliable, and free alternative to commercial platforms like DocuSign, PandaDoc, SignNow, Adobe Sign, Smartwaiver, SignRequest, HelloSign & Zoho sign' and is a E-signature tool in the office & productivity category. There are more than 50 alternatives to OpenSign for a variety of platforms, including Web-based, SaaS, Android, iPhone and iPad apps. The best OpenSign alternative is DocuSeal, which is both free and Open Source. Other great apps like OpenSign are Docusign, LibreSign, DottedSign and Adobe Fill & Sign.