The Interest Archive (aka The Wayback Machine) – Internet Archive is a non-profit library of millions of free books, movies, software, music, websites, and more.
Archive.Today – A time capsule for web pages! It takes a ‘snapshot’ of a webpage that will always be online even if the original page disappears. It saves a text and a graphical copy of the page for better accuracy and provides a short and reliable link to an unalterable record of any web page. This can be useful if you want to take a ‘snapshot’ a page which could change soon: price list, job offer, real estate listing, drunk blog post, etc. Saved pages will have no active elements and no scripts, so they keep you safe as they cannot have any popups or malware!
SnagIt by TechSmith – Image & Video Capture: Capture anything – a small region of your screen, wide panoramic scrolls, infinitely scrolling webpages, and more. Saves it locally on your computer as a graphic file.
Libraries of Historical Web Information
Archive-It – The leading web archiving service for collecting and accessing cultural heritage on the web
Search Engine Showdown – Leads for finding other sources of historical web information.