Does some know some LaTeX tool for Windows – preferably open-source –, which is more recent than LEd, but which have the auto-complete mechanism? I use LEd for so long, but in Windows 7 I'm facing to some bugs, and the tool is not updated since 2009. A note, WinEdt and the Miktex front-end do not have the auto-complete feature (or I was not able to configure it), and LyX is not WYSIWYM.
I tried TeXstudio and it impressive me quite well. It has the autocomplete mode (without need for typing control+space) of LEd, it has the colors of WinEdt, has the pdf viewer, the build is fast, has a log debugger. I shall switch to it (instead of LEd). Thank you all for the suggestions.