Texmaker (free cross-platform latex editor)

Texmaker : original LaTeX editor since 2003 by the creator of Kile
Copyright 2003/2012 Pascal Brachet - France with the contribution of J.Amblard for the LaTeX to html conversion tool.
This program is licensed to you under the terms of the GNU General Public License Version 2 as published by the Free Software Foundation.
Note : This program is the "authentic" Texmaker editor and there is strictly no relationship between this program developed since 2003 and another latex editor which uses intentionally almost the same name to trick users.

Texmaker