These days I'm a fan of Calysto Scheme: https://github.com/Calysto/calysto_scheme https://github.com/Calysto/calysto_scheme It's not blazing fast, but it's Sc

These days I'm a fan of Calysto Scheme: https://github.com/Calysto/calysto_scheme https://github.com/Calysto/calysto_scheme It's not blazing fast, but it's Scheme -- not paren-y syntactic sugar around Python.