The following text editors have syntax highlighting plugins for Dana:

VSCode for all platforms. In VSCode, go to View -> Extensions, then type "dana" into the search box. Click on the vscode-dana-language extension, then click "install".

Atom for all platforms. Within Atom, go to File -> Settings -> Install, then search under packages for language-dana and click on install (the first search result should be the package that you want).

Notepad++ for Windows. A Dana language definition file is available to download here. Save this XML file to your computer, then open Notepad++ and go to Language -> Define your language -> Import. From here, locate this XML file and click open.

gedit for Linux. A Dana language definition file is available to download here. Save this XML file to your computer, copy it into the language-specs folder of gedit and then restart gedit if it's currently open. Depending on your gedit version, this folder will be e.g. /usr/share/gtksourceview-3.0/language-specs/ or /usr/share/gtksourceview-4/language-specs/ (etc.).