The language, etc., is .NET 2.0+/Mono 2.6+ and doesn't require Windows, but the IDE is .NET 4.0+, Windows-only (per the readme on the Ela Platform 2014.1 download).
> .NET 2.0+/Mono 2.6+ ... but the IDE is .NET 4.0+
This is a perfect example why the naysayers were right when the Linux community talked about accepting Mono as default into the Linux mainstream. Fortunately Mono was rejected and remained as an option.