SERP

https://en.wikipedia.org/wiki/Search_engine_results_page
https://serps.com/
http://www.whatsmyserp.com/

Proxy

http://www.alltechbuzz.net/?s=Proxy

http://www.proxy4free.com/

https://www.4everproxy.com/

http://proxyunblocker.org/

https://en.wikipedia.org/wiki/Proxy_server

Pro News

http://www.webpronews.com/

Broken Link Checker

https://www.google.co.in/search?q=brokenlinks

Similar

Site
http://www.similarsites.com/

Web
http://www.similarweb.com/

More of it
http://www.moreofit.com/

Others
http://othersiteslike.org/

Search
http://www.similarsitesearch.com/

Top
http://www.topsimilarsites.com/

Tube
https://www.youtube.com/results?search_query=similar+sites