Shareaza

I have uploaded Boa, a Python GWebCache that I wrote a few years ago, to GitHub.

See https://github.com/kevogod/Boa/blob/master/README.md for more details.

I have just given a fast look at the source and it seems that Boa doesn't check urls.
Just check that the url is valid isn't enough; if the url is valid but it isn't a GWC it will cause a lot of unwanted requests to an innocuos site.