Syfy (see also Sci-Fi Friday and Ani-Monday)
(replaced Sci Fi on July 7, 2009)
IMDb; official website; TV Tropes; Wikia; Wikipedia

Some things that aired on this channel originated on Sci-Fi, so I'll list them on both pages, while others originated after the name change. Of course the network has aired reruns of various shows that originated elsewhere entirely, and I won't be listing those here. (That is, if they originated on other American channels; I may include shows that originated in other countries, but aired in America on Syfy.)

I lost access to Syfy in like June 2011, so there are a some series that I had to watch all or part of online, after that, and there are some things I haven't had a chance to watch at all. (Of course there are also plenty of things in which I have no interest.)

Warehouse 13 (July 7, 2009 - May 19, 2014; I watched s3-4 on Hulu, still haven't seen s5)
Eureka (s3.5-5, July 10, 2009 - July 16, 2012; s1-3.0 aired on Sci-Fi)
Alice (Dec. 6-7, 2009; miniseries)
Caprica (Jan. 22 - Oct. 26, 2010, Jan. 4, 2011)
Red: Werewolf Hunter (Oct. 30, 2010; TV movie)
Neverland (Dec. 4-5, 2011; miniseries; I watched on DVD)
Being Human (Jan. 17, 2011 - April 7, 2014; I probably only watched the first episode of this)
Treasure Island (5/5/2012; miniseries; originally aired on Sky One in the UK; I watched on DVD)
Defiance (April 15, 2013 - Aug. 28, 2015; I watched s1-2 on Hulu and s3 on Amazon)
Ascension (Dec. 15-17, 2014; miniseries; I watched online)
The Expanse (s1-3, Dec. 14, 2015 - June 27, 2018; I watched it on Amazon; s4 will stream on Amazon sometime in 2019)
Happy! (Dec. 6, 2017 - May 29, 2019; I only got a chance to see three episodes of this, online)

Aftermath
Blood Drive (A.V. Club)
Channel Zero
Childhood's End (miniseries)
Dead 7 (TV movie)
Deadly Class (A.V. Club; Crave; CTV Sci-Fi)
Killjoys (Crave; CTV Sci-Fi)
Krypton
Lost Girl
The Magicians
Riverworld (miniseries)
Sharknado (TV movie)
Van Helsing
Wynonna Earp
Z Nation