This is the entire list of free previews from the web page. Some have been extended and some have just started in the last few days or today.
Expires May 11, 2020
*FX
*Fight Network
*Hollywood Suite
*Abu Dhabi TV
Expires May 15, 2020
*Salt + Light Television
*Sportsman
*Series+
*ProSiebensat.1Welt
Expires May 18, 2020
*CTV News Channel
*LCN
Expires May 30, 2020
*One: Get Fit
*Lifetime
*NDTV
*Zee TV
Expires May 31, 2020
*CBC News Network
*Crime + Investigation
*BBC News World
*Food Network Canada
*CNN
*TLC
Expires June 30, 2020
*Global BC1 (it's not on the site for me in Winnipeg, assumed same as Shaw Direct)
*Disney Channel
*Disney Jr
*Disney XD
*Nickelodeon
*Teletoon
*Treehouse
*YTV
*Telalatino
*GMA Pinoy
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May 11 - May 30, 2020
*BeIn Sports
*Aaj Tak
*RTVI
*VGN TV
May 13 - June 10, 2020
*Investigation Discovery
May 15 - May 30, 2020
*Wild TV
*HGTV Canada
EDIT
Expires December 31, 2020
*Cartoon
May 30 - June 15, 2020 (not on web site, probably same as Shaw Direct)
*DIY