Here are the links to web sites mentioned in the article of the above name in the 009 News.
3D printed Rail Roller downloadable file from Cults 3D : https://cults3d.com/en/3d-model/various/rail-bending-jig (https://cults3d.com/en/3d-model/various/rail-bending-jig)
Fast Tracks Railroller (not readily available in UK?) https://www.handlaidtrack.com/tl-0004 (https://www.handlaidtrack.com/tl-0004)
Light Railway Stores inexpensive (but fixed geometry) rail bender: https://www.lightrailwaystores.co.uk/products/rb01 (https://www.lightrailwaystores.co.uk/products/rb01)
Cinder Path Models (UK-based home producer and occasional seller of inexpensive rail benders): https://www.facebook.com/watch/?v=443265950224670 (https://www.facebook.com/watch/?v=443265950224670)
Japanese micro layout kits: https://www.narrow-gauge-shop.com/introduction (https://www.narrow-gauge-shop.com/introduction)
One of Bob Sharp's micro layouts: https://www.009society.com/forum/index.php?topic=4811.msg34731#msg34731 (https://www.009society.com/forum/index.php?topic=4811.msg34731#msg34731)
NGRM Online home made rail bender (need to register and log in): https://ngrm-online.com/index.php?/forums/topic/29645-returning-to-the-narrow-fold/&do=findComment&comment=763946 (https://ngrm-online.com/index.php?/forums/topic/29645-returning-to-the-narrow-fold/&do=findComment&comment=763946)
Three points on a circle:
https://planetcalc.com/8116/ (https://planetcalc.com/8116/)
https://www.mathportal.org/calculators/analytic-geometry/circle-through-three-points.php (https://www.mathportal.org/calculators/analytic-geometry/circle-through-three-points.php)
Some other home-made rail benders achievable with a more fully-featured workshop:
https://www.youtube.com/watch?v=gw_xGtsHJtw (https://www.youtube.com/watch?v=gw_xGtsHJtw)
https://cascadedivision1964.wordpress.com/2013/12/03/small-distractions-making-a-rail-bender-for-under-10/ (https://cascadedivision1964.wordpress.com/2013/12/03/small-distractions-making-a-rail-bender-for-under-10/)
https://tardus.net/railBender.html (https://tardus.net/railBender.html)
https://ogrforum.ogaugerr.com/topic/home-made-rail-bender (https://ogrforum.ogaugerr.com/topic/home-made-rail-bender)
Edited to update the links