Alternatives to Java and C# for Client-Side Imaging?

SkyLeach asks: "I work for a medical company which wants to provide medical imaging solutions to their clients without having to install software on the clients' machines. We had been using Java, but this is becoming more and more difficult as the Microsoft VM becomes more outdated. According to this FAQ from Microsoft, java will receive no more support at all in the future. Without using a Windows-only solution such as ActiveX, what other options are there? Keep in mind that the only absolute requirement I have been given is that the physicians never be required to install anything on their computers: Sun's JVM and Microsoft .NET, included."