There are several options out there for editors. Please note that these plugins might have varying degrees of quality.
There is an Imba plugin for SublimeText 3. You can install it using package control.
A plugin vscode-imba can be obtained and installed from the editor's extension manager.
The Atom plugin repository contains a language-imba package.
Emacs mode for imba qwars/imba-mode.el
Vimba - Imba syntax highlighting for vim simeng/vim-imba