More potentially dead ones:

-1 Not found: An error occurred in the secure channel support https://manual.3dgamestudio.net/function.htm Functions
-1 Not found: The server name or address could not be resolved http://ggplot2.org/ ggplot2 examples.
-1 Not found: The server name or address could not be resolved http://docs.ggplot2.org/current/qplot.html here.
404 Not Found https://www.sciviews.org/Tinn-R/ Tinn-R [301 from http://www.sciviews.org/Tinn-R/]
400 Bad Request http://zorro-trader.com / Zorro website
-1 Not found: The certificate authority is invalid or incorrect https://www.optionvue.info/help/statisticalvolatility.html OptionsVue
401 Unauthorized https://rest.coinapi.io/v1/quotes/BITSTAMP_SPOT_BTC_USD/history?time_start=%s&time_end=%s&limit=100000 https://rest.coinapi.io/v1/quotes/KRAKEN_SPOT_BTC_USD/history?time_start=%s&time_end=%s&limit=100000
400 Bad Request http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=447697&#Post447697 Zorro user forum
404 Not Found https://financial-hacker.com/2015/09/14/whites-reality-check/ White's Reality Check [301 from http://www.financial-hacker.com/2015/09/14/whites-reality-check/] [301 from https://www.financial-hacker.com/2015/09/14/whites-reality-check/]
400 Bad Request https://rest.coinapi.io/v1/ohlcv/BTC/USD/history?period_id=1MIN&time_start=d-d-01T00:00:00&limit=%d https://rest.coinapi.io/v1/ohlcv/BTC/USD/history?period_id=1MIN&time_start=d-d-01T00:00:00&limit=%d
404 Not Found https://zorro-project.com/manual/en/plotwidth.htm PlotWidth
404 Not Found https://zorro-project.com/manual/en/advise.htm rules
404 Not Found https://zorro-project.com/manual/en/filters signal processing
404 Not Found https://zorro-project.com/manual/en/tutorial_func.htm functions
404 Not Found https://zorro-project.com/manual/en/acrt-goto.htm goto
404 Not Found https://zorro-project.com/manual/en/r.hhtm R
404 Not Found https://zorro-project.com/manual/en/books.htm book list
404 Not Found https://zorro-project.com/manual/en/aentity-skill.htm skill
404 Not Found https://zorro-project.com/manual/en/bmap_blit.htm local variables
404 Not Found https://zorro-project.com/manual/en/frechet.htm frechet
404 Not Found https://zorro-project.com/manual/en/r.htm Rd
404 Not Found https://zorro-project.com/manual/en/comparison.htm >
404 Not Found https://zorro-project.com/manual/en/mt4bridge.htm MT4
404 Not Found https://zorro-project.com/manual/en/brokerplugin2 BrokerHistory2
404 Not Found https://zorro-project.com/manual/en/buy.htm trade
404 Not Found https://zorro-project.com/manual/en/htm HFT
404 Not Found https://zorro-project.com/manual/en/features.php <No Text>
404 Not Found https://zorro-project.com/manual/en/timeframe.htm TimeFrame
404 Not Found https://zorro-project.com/manual/en/waittime.htm OrderDelay
404 Not Found https://zorro-project.com/manual/en/plotscale.htm plotScale
404 Not Found https://zorro-project.com/manual/en/allcycles.htm ALLCYCLES
404 Not Found https://zorro-project.com/manual/en/barzone.htm BarZone
404 Not Found https://zorro-project.com/manual/en/wait.htm wait()
404 Not Found https://zorro-project.com/manual/en/manual/en/restrictions.htm trading restrictions
404 Not Found https://zorro-project.com/manual/en/kelly.htm Kelly factors
404 Not Found https://zorro-project.com/manual/en/indicator.htm Indicators
404 Not Found https://zorro-project.com/manual/en/income.htm Income
404 Not Found https://zorro-project.com/css.css link/href