TexMaker is a unicode editor that helps you write your LaTeX source files.
This program has a clean and modern interface which makes it easier to write your LaTeX document. There are "LaTeX" and "Math" menus which produce the principal LaTex tags and insert them directly into your file. More than 350 mathematical symbols can be inserted with one click! There is support for syntax highlighting, code completion, undo-redo, search-replace, spell checker, bi-directional support. LaTeX-related programs can be launched with "Tools" menu. Save your project as a LaTeX file or convert it to an HTML file using an integrated LaTeX to html conversion tool! Finally TexMaker comes with an extensive LaTeX documentation.
There are portable and installable Texmaker versions for Windows, Linux, MocOS. So you can find a version for your system.
There are installable and portable versions of texmaker. Portable version needs to be extracted in a folder and run "texmaker.exe"