One that kept getting mentioned in a positive light was RAW Therapee. This is Open Source and available in Windows, Mac and Linux versions.
I thought it might be worth a go, so I downloaded it and tried it out with an image I took in Whitby recently.
Raw Therapee lets you select either standard Beyer colour filter or Trans X in the Demosaic section, you can then apply sharpening in various degrees like Edge, Micro contrast etc.
I let Raw Thereapee decide all the settings as this was the first time I had used it. I saved it as a 16bit TIFF and then imported into Lr for some adjustment and exported as a jpg for this blog.
Here is the result compared to the usually very good Out of Camera jpg from the Fuji X Pro 1.
|Out of Camera X Pro 1 jpg|
|RAW Therapee Demosaiced TIFF, adjusted in Lr.|
This deserves further investigation and experimentation.