Thinfinity Remote Desktop, from Cybele Software, delivers Windows applications and desktops to any device with an HTML5 browser, so no client installation is needed for browser access. It can also act as a browser front end for VDI, virtual machines, RemoteApps and Unix systems, and works with Hyper-V, VMware and VirtualBox. Features include file transfer, remote printing, multi-monitor support, session recording and user management. Authentication can use Windows or Azure Active Directory, with single sign-on via OAuth2 and SAML or RADIUS for two-factor authentication. Directory listings describe deployment as SaaS, on-premises or hybrid, including AWS and Azure.
Cybele Software is a United States company, so the vendor falls under US jurisdiction, including the CLOUD Act. The software is not open source. Where data resides depends on the deployment model: an on-premises installation keeps sessions on infrastructure you operate, while the pages consulted do not state where a vendor-hosted service would run. Check the hosting terms before choosing SaaS.