Autogram is a free application for signing documents electronically with a qualified electronic signature, for example using an eID card or another qualified signing device. It is available as a desktop application for Windows, macOS and Linux, as a mobile app for iOS and Android, and as a browser extension for some Slovak government sites. It supports the European formats XAdES, CAdES, ASiC-E and PAdES, can sign several documents in one go, checks signatures and timestamps, and offers a REST API for integration with other software.
Autogram is maintained by Služby Slovensko.Digital s.r.o. in Bratislava, Slovakia, a company wholly owned by the civic association Slovensko.Digital. The source code is open source under the EUPL-1.2, and development was co-funded through NLnet's NGI0 Commons Fund with support from the European Commission. According to its makers, data is processed locally on the user's computer. You install the software yourself, so documents and keys stay under your own control.