Besides KDE and Gnome, is there any other Desktop Environment?

I tried searching from Google, but I cannot get a list of them.

Thanks in advance.

Desktop environment tends to be a complete destop system including filemanager and taskbar and so forth. Window manager just handles the windows. So there is a bit of overlap. KDE and Gnome are the big ones. There are a lot of WM's tho, and some have various levels of DE... Most linux distros come with several WM's...

1) Actually what makes the difference among these windows managers (except visual effect)?
2) Is Desktop Environment = Windows Manager + Applications only?

I have found a similar thread here but the information seems to be outdated. Can anyone help me?

Well, both DE's and WM can both access applications, so that's not the big difference really, tho with a DE like KDE it means that the apps wll all have the same look and feel. In the end I suppose that a DE is a matter of degree of how many extra services and panels and dektop switching tools and stuff. For example, is xfce a DE or just a WM... Good question. It's either a heavy WM or a light DE... In the end I suppose it doesn't matter and you just use whatever suits you best...

Mostly it's a visual thing and a common look and feel across the applications....