Kile is described as 'user-friendly TeX/LaTeX editor by KDE. Kile gives you the ability to use all the functionality of LaTeX in a graphical interface and has interactive preview mechanisms to readily see the results of editing' and is an app in the Development category. There are more than 25 alternatives to Kile for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and Haiku. The best alternative is LyX, which is both free and Open Source. Other great apps like Kile are Overleaf (Freemium, Open Source), TeXstudio (Free, Open Source), Texmaker (Free, Open Source) and TeX Live (Free, Open Source).
LyX is a document processor that encourages an approach to writing based on the structure of your documents (WYSIWYM) and not simply their appearance (WYSIWYG). LyX combines the power and flexibility of TeX/LaTeX with the ease of use of a GUI.
TeXstudio is an integrated environment for writing LaTeX documents. Our goal is to make writing LaTeX as easy and comfortable as possible. Therefore TeXstudio has numerous features like syntax-highlighting, integrated viewer, reference checking and various assistants.
TeX Live is an easy way to get up and running with the TeX document production system. It provides a comprehensive TeX system with binaries for most flavors of Unix, including GNU/Linux, and also Windows.
Authorea is the online document editor for researchers that allows researchers to write, cite, host data, and publish research documents. Authorea is trusted worldwide by leading researchers writing and publishing content in every discipline, from astrophysics to zoology.
TexMaths is an addon designed to provide LaTeX support into LibreOffice. LaTeX equations can be inserted as images (SVG or PNG formats) and the LaTeX code is saved into the image attribute for further editing.
The TeXworks project is an effort to build a simple TeX front-end program (working environment) that will be available for all today’s major desktop operating systems—in particular, MS Windows (XP and Vista), typical GNU/Linux distros and other X11-based systems, and Mac OS X.