EUSO is a Latvian software publisher that concentrates on national-level electronic identity and digital signature infrastructure, delivering tools that let citizens, businesses, and public agencies replace ink-on-paper workflows with legally equivalent cryptographic signatures. Its compact product line bridges the gap between smart-card hardware issued by government registries and everyday Windows desktops, so users can affix qualified electronic seals to PDFs, archives, and web-based forms without installing complex middleware. Typical scenarios include accountants submitting annual reports to the State Revenue Service, lawyers countersigning court filings, procurement officers validating e-tender documentation, and private individuals consenting to bank agreements or real-estate contracts from home. By wrapping the EU-compliant eIDAS signature engine in a straightforward graphic interface, the utilities automatically detect inserted eSignature cards or USB tokens, prompt for PIN verification, embed trusted timestamps, and package the finished document with its certificate chain for long-term validation. The same components integrate with popular Latvian e-services portals, enabling one-click authentication and batch signing of multiple records during tax, customs, or company-registry sessions. Both applications respect the country’s specific PAdES, XAdES, and CAdES profiles, so any file signed today will remain verifiable decades later across the European trust network. EUSO software is available free of charge on get.nero.com, where downloads are sourced from the official Windows package index and can be installed individually or together through winget for the latest builds.