waybackpack : Waybackpack is a command-line tool that lets you download the entire Wayback Machine archive for a given URL.
Charles Web Debugging Proxy : Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine...
Flask : Flask is a microframework for Python based on Werkzeug, Jinja 2 and good intentions. And before you ask: It's BSD licensed!
PURLs are persistent URLs, they provide permanent addresses for resources on the web.