Code Completion: Yes (using Omni Completion, extendable with SnipMate plugin).
% !TEX directives: No, but has modelines.Platforms: Windows, Mac, Linux and others.adjustable icon size makes it suitable for high resolution displays ( preferences-> show advanced options-> gui scaling).very active and responsive developer and community.smart BibTeX auto-complete (including multiple, comma-separated citations) and hovering on \cite text shows a preview of the BibTeX entry.tools for easy table editing and table-code formatting.live-updating inline preview for formulas and code segments.
pdf viewer included, but can be configured to use external viewers (also with synctex).support to the main latex tools, including tikz, pstricks, etc.search, folding, navigation, auto-completion, custom macros) I'd recommend TeXstudio an interesting fork of Texmaker that I find more usable and customizable. Built-in Output Viewer: Yes, supports PDF.Spell Checking: Yes, including grammar checking based on LanguageTool.Code Completion: Yes, customizable and auto-customized.Languages: cs, de, en, es, fr, hu, ja, pl, pt_BR, ru, vi, zh_CN.
If you’d like to see another editor feature covered here or to take care of an editor that’s not covered yet, share your ideas in that meta question. This question is undergoing a systematic refurbishment, see Let’s polish the Editors/IDEs question on Meta. Please state some useful features like code completion, spell checking, building final DVI or PDF files, etc.
What editors/IDEs are available for easing the process of writing TeX/LaTeX documents?