TeXShop

TeXnicCenter

Quite old but free and decent editor for LaTeX. windows

Texifier

Commercial LaTeX editor for macOS and iOS, with excellent features (document overview, synchronised PDF display, autocompletion, sync across devices, etc.) that never get in the way of writing. mac

LyX

Cross-platform WYSIWYM editor that uses LaTeX behind the scenes to render documents. foss

BakomaTex

Commercial LaTeX editor that allows to edit your document both using its source code and WYSIWYG