This Blender (2.8) add-on rotates the local axis of the selected object to align with either the local axis of the active object, the axis of a custom transform, or the orientation of the 3D cursor.

The FLIP Fluids addon is a tool that helps you set up, run, and render high quality liquid fluid effects all within Blender, the free and open source 3D creation suite. - FLIP Fluid Object Types · ...