Ethereal Spawn and
Soultorn are established acts with at least one album each, and both put their DT cover on their album.
Neptune is also an established act, although, as far as i know, they've only played
The wonders live but never included it in any release.
Korhan Kaya is some bloke who makes techno covers of songs and puts them on his website.
Grum Lee is a chap who makes acoustic-guitar + shitty-voice-with-french-accent covers and puts them on his site. It is highly-recommended that you avoid both, but if you want a good laugh then Grum Lee is your guy.
Somewheres and Sageh are, respectively, a band and a bloke (i think that both are from Turkey, but i'm not sure; i know that at least Somewheres is) who aren't famous at all (to the point of not even returning anything on a fairly-extensive Google search) but aren't, as far as i know, from YouTube.
Everyone-else listed on that site is from YouTube, but some (like
Chaotic Darkness and
Ercorea) are extremely-good.