You may know the scenario: a retro machine, maybe some kind of network connection, even a fairly capable browser like one of the Netscape variety, but no way to access the modern web.
Browservice: Browser as a Service
In retrocomputing, the modern web is inaccessible, because up-to-date web browsers are not available for old operating systems, and old browsers do not support modern web standards. Furthermore, old operating systems and browsers should not be connected directly to the Internet because they typically have unpatched security vulnerabilities. Browservice circumvents these issues by offloading the web rendering to a proxy server running an up-to-date web browser; the actual client browser connecting to the proxy only needs to show the images sent by the proxy server and forward the user input back to the proxy.
Compatible OSes comprise anything like Windows for Workgroups 3.11, OS/2 Warp 4.52, Win 95 and newer. (I guess, anything capable of running a Netscape or Mosaic browsers.)