[ai_ia]

Emacs because of Org Mode.

[pweissbrod]

Vim also supports org mode as well. Not quite as nice as emacs but it gets the job done for me

[vvillena]

Syntax highlighting and basic outline support is not orgmode. Orgmode is an agenda, a smart task scheduler, a spaced repetition learning system, a publishing environment, a literate code tool, a knowledge base...