HTTP Replicator is a general purpose caching proxy server written in python. It reduces bandwidth by merging concurrent downloads and building a local 'replicated' file hierarchy, similar to wget -r. The cache is also accessible through a web interface
Proxy Tester is a proxy list tester and then it generates a wpad.dat file you can use for your browser based on working servers. wpad.dat file selects a random proxy server from the list of provided working proxy servers with each connection request.