Proxymini is a proxy server that fully supports HTTP, HTTP CONNECT (for HTTPS and so on), SOCKS4 (TCP and TCP bind), and SOCKS5 (TCP, TCP bind, and UDP). It's designed to be small, and for being used in trusted environments where there is no need for complex or advanced options. Double-click on it and it will work immediately. It supports some options like the binding of a specific interface for incoming or outgoing connections, a custom port to bind (the default is 8123), and stdout and file verbose logging.
Smitten differs from traditional media centres in three major ways. It contains no media playback at all, which makes it very small (and suitable for porting to embedded systems) and quick to initialize. It targets a TV display and interface, which means there's less information on any particular screen, and a much simpler control interface consisting of left, right, up, down, and select. No mouse is required. It is also highly skinnable, and cross-platform to most systems. Essentially, it provides an easy-to-use menu system that allows the user to navigate a hierarchy of files, and view them using an (external) tool.
The 64 Studio Platform Development Kit (PDK) is a version control system for GNU/Linux distributions, allowing the creation and management of many different projects, based on Debian and Ubuntu sources. PDK is written in Python, and the source code is well commented and contains documented examples.