D is the most open language you will find. It is Boost licensed, which has the least restrictions of any language you'll find:
https://www.boost.org/users/license.html
The compiler is 100% Boost licensed.
Nobody pays me a dime for D.
Terribly sorry about that. I've moved you into the list. It's been a long time now but I really did like D and its meta-programming features.
D is the most open language you will find. It is Boost licensed, which has the least restrictions of any language you'll find:
https://www.boost.org/users/license.html
The compiler is 100% Boost licensed.
Nobody pays me a dime for D.