Grail^® is an extensible Internet browser written in the interpreted object-oriented programming language Python. It runs on Unix, and, to some extent, on Windows and Macintosh. Grail is distributed in source form, free of charge, and without warranties. It requires Python and Tcl/Tk to run. It supports the protocols and file formats commonly found on the Web, such as HTTP, FTP, and HTML, but it is also easily extended to support other protocols or file formats, such as those used in CNRI's Handle System, described at Handle.Net^®.

Grail development is now hosted on SourceForge. The project page provides links to information about accessing the Grail repository. The CVS repository imported at SourceForge contains Grail 1.6 (with minor patches).