Solution 1:

It's true that Trixie has been developed a long time ago but it actually works with IE7, IE8, IE9, IE10 and even IE11. I've been using it for a long time.

Some time ago the website went down but you can download it from my Dropbox: Trixie 0.2.3.zip

To operate it:

  1. put your userscript in c:\Program Files (x86)\Bhelpuri\Trixie\Scripts\ folder (it contains some samples you can start with)
  2. restart IE or go to "Tools" -> "Trixie Options" menu and click "Reload Scripts" button (no need to restart IE)

Also you can enable/disable scripts using checkboxes. That's pretty much all you need to know.

NOTE: One issue though, the script is not executed on page refresh (F5 or Ctrl+F5), you need to click on the address bar and hit Enter (not a deal breaker, at least for me).

Solution 2:

A Trixie Clone has been developed, that works with IE11 on Windows 8:

http://sourceforge.net/projects/trixiewpf45/

It is not the simplest to use, i.e. if you develop userscripts you have to reload them via the Trixie settings panel to refresh the scripts.

Blurb from site:

Several years ago, there was Trix on http://www.bhelpuri.net/Trixie/.
But there is no official sites, only a copy of Ver.0.2.3 could be gotton.
I got a trouble after I installed IE11.
I've tried to solve my problem making own Greasemonkey and got it.
I've looking for the way how my Greasemonkey could be applied on IE11.
Then I got Trixie binary and started to rewrite it.