A comparison of PASCAL and ALGOL 68
Abstract and text in TIFF form from The Computer Journal, Volume 21, Issue 4, pp. 316-323.
Algol 68 Genie (Algol68G)
A fairly fully featured Algol 68 implementation (interpreter) for Linux, BSD and MacOS. Author of Algol68G is Marcel van der Veer. [Open source, GPL]
Algol 68 Revised Report
Ongoing project to create machine readable Algol 68 Revised Report (this version in HTML).
Algol 68 to C
Portable translator to allow compiling Algol 68 code, and some example Algol 68 programs in the same directory.
An Experimental Testbed for Numerical Software, part 2: ALGOL 68
By M.A. Hennell, D, Hedley; The Computer Journal, Volume 22, Issue 1, pp. 53-56. Abstract and text in PDF format.
Charles Lindsey's Home Page
Algol 68S compilers for Sun3, Sun Sparc, Atari ST and Acorn Archimedes.
Computer Engineering by Gordon Bell et al.
A brief description of ALGOL 68 System implemented on Cm*.
Historic Documents in Computer Science
Has scans of many Algol 68 documents including the RRE Algol 68R 'Green Book.'
Marc's Programming Projects
Unfinished project to write Algol 68 compiler; source code provided in CWEBx.
Practical experience with ALGOL 68-RT
Abstract and text in PDF form from The Computer Journal, Volume 22, Issue 2, pp. 114-118.
Programming denotational semantics II
using Algol 68. Abstract and text in PDF form from The Computer Journal, Volume 28, Issue 5, pp. 480-486.
Revised Report on the Algorithmic Language ALGOL 68
A translation of the Report into HTML by W. B. Kloke.
The Use of ALGOL 68 for Trees
By H.D. Baecker; The Computer Journal, Volume 13, Issue 1, pp. 25-27. Abstract and text in PDF format.
VanWijngaarden MR76.pdf
A. vanWijngaarden's MR76 paper on the orthogonal design of a language from 1965, which was the starting point of Algol 68.