SublimeText
Atom [FOSS]
Brackets [FOSS]
BBEdit
TextMate
TextWrangler
Chocolat [FOSS]
vim and macvim [FOSS]
Hexfiend [FOSS]
0xED
Xcode (C*, Swift)
CLion (C*)
IntelliJ IDEA (Java)
PHPStorm (PHP)
Photoshop
Sketch 3
Pixelmator
Affinity Designer
GIMP [FOSS]
Sip (color picker)
Paintbrush
Preview
Xee
simplecomic [FOSS]