Texmaker is a free, modern and cross-platform LaTeX editor for Linux, MacOS X and Windows systems that integrates many tools needed to develop documents with LaTeX. It includes unicode support, spell checking, auto-completion, code folding and a built-in pdf viewer with synctex support and continuous view mode. Texmaker is easy to use and to configure.
TeXpen is an intuitive LaTeX editor. It comes with built-in themes/background sets, provides live article outlines, equation previews, keyword highlighting and auto-completion, document templates. It simplifies interting tables and figures, bundles a spell check, and can easily build a PDF.