In terms of web-oriented languages that are succeeding despite not being company-backed, Haxe is my personal favorite. Its flash target improved on AS3 compile

In terms of web-oriented languages that are succeeding despite not being company-backed, Haxe is my personal favorite. Its flash target improved on AS3 compilers back in the day, and is now providing a bridge for old Actionscript developers to exit their collapsing walled garden.