WWE owns all talent names, images, likenesses, slogans, wrestling moves, trademarks, logos, and copyrights. They own everything on this site and nothing could happen without them.
WWE Games department is responsible for putting together the video games along with 2k Games. (Previously THQ) Without this department, there would be no video games for the WWE.
Xylot Themes is a database for all entrance music used in the WWE and other companies. They gave me the idea for this website and a lot of things on the site are similar to Xylot as in the specific roster pages & the superstar of the month. (Week for Xylot) Please check this site out as it has a lot of useful information. I have been a member there since 2008 and still am very active.
In each roster bio page, there is an entrance video for that specific superstar. Not all, but a majority of the entrance videos come from this youtube user. Check him out as he has many entrance videos on youtube for you to browse at full length of the theme.