those websites were made a few years(2013~2015) ago. Some bug occurs in modern browsers, screens, missing resources , and others.
Most of those websites were using jQuery, some of them had their own subsystem to control all progress when browsing by users.
Some of those websites need to have transactions with background API; as you know, it may be stopped service already [ooouch].
quick overview
http://nuocats.unaux.com/Works/#/overview
product links
http://nuocats.unaux.com/fonepad/
https://www.asus.com/EVENT/gifting/UK
http://nuocats.unaux.com/Zenwatch/
http://nuocats.unaux.com/zenfone/
http://nuocats.unaux.com/pixelMaster/
http://nuocats.unaux.com/X455WE/
http://nuocats.unaux.com/G771JMC/
http://nuocats.unaux.com/G750JM/
http://nuocats.unaux.com/G551JM/
http://nuocats.unaux.com/F550LD/
http://nuocats.unaux.com/AsusT100/
http://nuocats.unaux.com/xmas-fone/
http://nuocats.unaux.com/careerTest/
http://nuocats.unaux.com/AsusZ500M_Spec/