bcc is an enhanced ACS bytecode compiler for the ZDoom family of ports.

strict namespace SampleCode {
   script "Main" open {
      static str basket[] = { "apples", "oranges", "pears" };
      foreach ( auto fruit; basket ) {
         Print( s: "I love ", s: fruit, s: ( fruit == "oranges" ) ?
            " very much" : "" );
      }
   }
}

BCS is an extension of ACS. BCS is mostly compatible with ACS and provides many interesting and useful features, including the following:

• Structures
• Enumerations
• Namespaces
• Preprocessor
• Strong types
• Block scoping
• Optional function parameters
• Object and function references
• && and || operators are short-circuited
• foreach loop
• ?: operator

See the wiki page for an overview of the features.