For some developers, source access must be a huge deal over Unity free version - if you want to roll your own entity system or do a native plug... WAIT! unity 5

For some developers, source access must be a huge deal over Unity free version - if you want to roll your own entity system or do a native plug... WAIT! unity 5 is now out, including all features in the unity engine for free (including native plugins), with no subscription, and entirely invalidating the premise of this comment.