Elliott ALGOL was an ALGOL 60 compiler for the Elliott 803 computer. It was implemented by Tony Hoare and others. It differed slightly from the reference version of Algol, particularly in the supported character set. First released in February 1962, it is believed to be the first implementation of an ALGOL 60 compiler in a commercial context and was an unexpectedly popular product for the company.
References
Elliott ALGOL Wikipedia(Text) CC BY-SA