What is "winshell"

WinShell is a freeware, closed-source multilingual integrated development environment (IDE) for LaTeX and TeX for Windows.

WinShell includes a text editor, syntax highlighting, project management, spell checking, a table wizard, BibTeX front-end, Unicode support, different toolbars, user configuration options and it is portable (e.g. on a USB drive). It is not a LaTeX system; an additional LaTeX compiler system for Microsoft Windows (such as MiKTeX or TeX Live) is required.