OpenSign is described as 'Open-source PDF e-signature solution with secure cryptographic signing, audit trails, completion certificates, API integration and multi-device support' 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.
OpenSign alternatives are mainly E-signature Tools, but if you're looking for
Document Managers or CAD Software you can filter on that. You can also filter by region, for example
EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to OpenSign.