What is "texstudio"

TeXstudio is a cross-platform open source LaTeX editor with an interface similar to Texmaker.

TeXstudio is an integrated writing environment for creating LaTeX documents that provides modern writing support, such as interactive spelling checker, code folding, and syntax highlighting. It does not provide LaTeX itself – the user must choose a distribution of LaTeX and install it first.

Originally called TexMakerX, TeXstudio was started as a fork of Texmaker that tried to extend it with additional features while keeping its look and feel. It runs on Windows, Unix/ Linux, BSD, and Mac OS X systems.