Template files (.tpl) are plain text. You can only use a text editor like Notepad++. Personally, I use Bluefish as my main "tool" for editing.
Modules for OpenCart 2.3.0.2
Homepage Module [Free - since OpenCart 0.7.7]
Multistore Extensions
Store Manager Multi-Vendor/Multi-Store management tool
If you're not living on the edge ... you're taking up too much space!
I use Sublime Text 3 for editing templates 

http://www.viethemes.com - OpenCart turtorials, news, tips and stricks, extension
Our extensions:
Visual Theme Editor - Powerful tool for customizing style of any theme visually
Live Theme Editor - Customize layout, colors, backgrounds, fonts of the default theme
Theme Animation - Animation Editor for any theme
Extra Positions PRO, Custom JavaScript, Custom CSS and others
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