1. IA Archival Copies of. http://www.lanl.gov/errors/service-unavailable.php
2. Web crawler for Java. https://github.com/yasserg/crawler4j
3. Archive-it-web archiving services. https://archive-it.org/
4. Arquivo.pt - search pages from the past!. https://arquivo.pt/
5. Internet archive wayback machine. http://web.archive.org/