Houdini Ramp Manager [Digital Asset] on Vimeo
Ramp Manager is a Python-based HDA which allows you to save colour and spline ramp presets for reuse across Houdini sessions.
You can forward ramps from the asset onto any other node and perform some common ramp manipulations.
I've personally used it to save visualisers (heat-map, blackbody etc), spline ease functions and many project-specific colour schemes.
You can download it as part of the Aelib library here:
https://github.com/Aeoll/Aelib
Or on its own here:
https://goo.gl/j47nrI