Sublime Linter should do the trick. You can add underlining for custom static text.
All you need is the Sublime Package Manager:
- Press Ctrl/Cmd+Shift+P
- Search for "Package Control: Install Package"
- Search for "SublimeLinter"
As stated by jon in the first comment:
For ST3, the SublimeLinter-annotations plugin highlights TODO, FIXME etc.
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