*Lisp.QLA++A+ (programming language)A-0 SystemA-normal formABAPABC (programming language)ABC ALGOLABSETACC (programming language)ACL2ADMBAIMMSALCORALGOLALGOL 58ALGOL 60ALGOL 68ALGOL 68SALGOL NALGOL WALGOL XALGOL YAMBITAMOS (programming language)ANSI/ISO C Specification LanguageAPLXARITH-MATICATOLL (programming language)ATS (programming language)AWKA Language for Process SpecificationA Sharp (.NET)Abstract-Type and Scheme-Definition LanguageAbstract State Machine LanguageAbstract syntax