Resume Fluid Bake

A Blender add-on that tricks Blender into thinking that it had paused baking your fluid simulation at the frame you selected.

Especially useful when Blender crashes or closes unexpectedly during the fluid simulation baking process and there is no "Resume" button when you later open the project again.

Instructions:
Just check what the last frame Blender baked was and input the number in the add-on.
Make sure the number of the frame you select is the last one from the cache you already have, unless there is a sudden drop in size. In that case delete that last cache file and resume from the previous one. If this doesn't work correctly, try resuming from 2 or more frames before the crash. (This is what has worked for me, at least.)
Then press one of the buttons below, according to what type of cache you want to resume. And lastly, click on the usual "Bake" button in the properties panel and Blender should resume baking from the frame you selected.

Your settings should be identical when resuming or unexpected things could happen to your simulation.

Use at your own risk.