Algol 60 (Algorithmic Language 60) is a historical language introduced in 1960.
It is well-known for its unusual combination of a call-by-name evaluation strategy with an imperative store, or memory. This combination allows for certain rare and highly idiomatic ways of programming, such as Jensen's device. As a result, ALGOL 60 is the paradigmatic Algol-like language.
The IFIP WG2.1 has a continuing responsibility for ALGOL 60 and ALGOL 68.
IFIP WG2.1 maintain a list of ALGOL resources.
The language was defined in a famous document, the Revised Report (Naur et al, 1963). This was later followed by the Modified Report, which was published in 1976.
The Software Preservation Group at the Computer History Museum (in Cambridge, UK) maintains a page on ALGOL.
A somewhat strange website maintains pointers to a wealth of material, resources, and implementations of ALGOL 60.