Grail was a free extensible multi-platform web browser written in the Python programming language. The project was started in August 1995, with its first public release in November of that year. The 0.3 beta contained over 27,000 lines of Python. The last official release was version 0.6 in 1999.
^Scripting the Web with Python, I wrote Grail version 0.1 in less than two weeks, as a sort of demo; it consisted of under 2000 lines in 14 source files. It was released in August 1995., Guido van Rossum