TeXstudio has been forked from Texmaker in 2009, because of the non-open development process of Texmaker and due to different philosophies concerning configurability and features. It is a free and open source code editing application that's user friendly.
Here are some screenshots to illustrate the features and user interface of this application:
Atlantis Word Processor
Onlyoffice
FocusWriter
WPS Office
Microsoft Office 2016