Mono 4.0.0 have been released on 29 Apr 2015. I think it is worth to note about this release. It brings for first time Microsoft open source code, defaults for C# 6.0 and have lighter Debugger overhead.
http://www.mono-project.com/docs/about-mono/releases/
http://www.mono-project.com/docs/abo...eleases/4.0.0/
http://news.softpedia.com/news/Mono-...e-477617.shtml