[HarshaThota]

What's wrong with C#? It seems like you like the language and are only concerned about the software costs, so Mono would be an obvious option to look into. And the compatibility has improved quite a bit, to the point that there are quite a few projects that support multiple platforms:

http://www.servicestack.net/

http://nancyfx.org/

http://monogame.codeplex.com/

http://monocross.net/

https://github.com/markrendle/Simple.Web

[deevus]

You make a good point. I haven't touched mono for a long time, so maybe it is worth another look.