Not necessarily written for Windows platforms, but nevertheless worth a look, are the extensions written for Python by Marc-André Lemburg. Most extensions come with a Python-style license and can be freely used for your own projects (although some do require a license for commercial use: see the license for details). Many of them even include precompiled binaries for direct use on Windows; installation is then a matter of unzipping the package archive.
You can download the most recent versions from the
Starship server, where many other
Pythoneers also keep their gems. The documentation, license
information, and download instructions are all just a few clicks away