TextMate

TextMate is a “powerful and customizable text editor” for the Mac from MacroMates Ltd. with support for “a huge list of programming languages”, HTML markup, and general use. Designed to bridge “Unix underpinnings and GUI” to “cherry-pick the best of both worlds to the benefit of expert scripters and novice users alike”, TextMate offers project grouping, window tabs, text folding, macros, text snippets, regular expressions, syntax highlighting, WebKit-based HTML previews, column editing, auto-completion, visual bookmarks, shell commands and much more (see the TextMate 2 manual and “TextMate 2 Basics” posts for more details).

TextMate 2.0.6 is available as a free open-source download for macOS 10.12 and up (and older versions support Mac systems back to Mac OS X 10.4/PowerPC), or it can be purchased at $56.