Vincent Isambart introduced MacRuby, a Ruby implementation for Mac OS X. MacRuby aims to provide the best Ruby experience for desktop development on Mac. It is based on Ruby 1.9 to leverage improvements and be the future of Ruby. MacRuby 0.5 focused on solving problems of the previous 0.4 version like speed and threading by creating a new virtual machine. However, 0.5 still has weaknesses around memory allocation speed and only working on 64-bit systems. The community is encouraged to help with testing, tutorials, and pure Ruby libraries.