High-level description
Viennese company Apilayer offers eversign, an electronic signature application featuring document security and storage with audit trail, templates, contact management, and integrations with other popular applications (e.g. Dropbox, Google Docs, etc.).

Free lifetime updates
- Open source design system
- Automated feature upgrades
- Templates
- Security updates

Infrastructure and security
- SSL everywhere
- Automated backups
- Log scanning and alerts
- 24/7 monitoring