"Texmaker is a free, modern and cross-platform LaTeX editor for linux, macosx and windows systems that integrates many tools needed to develop documents with LaTeX, in just one application." The Texmaker website is at: http://www.xm1math.net/texmaker/
Comparison Between Texmaker and Kile
Kile is more feature rich than Texmaker at present. Unlike Kile, Texmaker does not depend on KDE in any essential way, though it is written in QT.