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I'm looking for (free software) alternatives to Parallels Remote Application Server [1][3] or VMware Horizon (formerly called Horizon View) [2]. A software that can be used to access Windows or Linux applications via application virtualization just by using a browser.
I think Citrix Virtual Apps (formerly called Citrix XenApp) can do the same (not 100% sure).
Does a free software solution exist that can do something like this?
Novnc is what you need.
It is effectively a proxy between the Javascript Websocket API of the browsers, and a VNC server.
It is up to you, how do you create the VNC service. I personnaly created a script, which combines an Xvfb and an icewm into a systemd service. On this way, I could create browser accessible virtual linux desktops on hosted virtual servers.
The disadvantage is, the configuring it correctly is more complex as you would expect. Novnc has a server-side and a client-side API, you need to serve both correctly. Furthermore, also the security between the browser-novnc, and on the novnc-vncserver communication requires some work in a productive setting. But it can be done.
I hunted this image from the Internet, it is not my system.
This answer explains, how can you export only a single window with x11vnc.
