HTML, XML, CSS, JavaScript, Makefile, and Rust. It works passably on Ruby, PHP, VB, and Awk and a decent subset of Perl and Ruby, but because of commenting conventions, doesn't work on Smalltalk, ...

Tacit's goal is to be super simple and always with the same look-and-feel. If you want something more custom, like a different theme, feel free to make it on top of Tacit. Here are some frameworks ...