dhor: Pretty good list, but you missed a bunch of projects:
Darktable (Linux/OS X) - free,Rawtherapee (Linux, OS X, Windows) - free,AfterShot Pro (Linux, OS X, Windows) - commercial,Rawstudio (Linux,??) - free,Photivo (Linux, OS X, Windows) - free.
... and probably few others for Windows platform.
While I find Paint Shop Pro a little short of Photoshop, I find AfterShotPro a very useful Raw File editor. Before Corel sucked it up, it did have some stability issues. But with the upgrade since the name change, I have not had a crash. You can select parts of the picture for selective editing. The non destructive editing is good since the original file is not changed from what the camera produced.
In the past, I used Bibble Pro. When Bibble sold out to Correl, the name was changed to After Shot Pro. This software is availble for Windows, Mac and Linex. I like it because of the capability to make adjustments to selected areas independent of the rest of the picture. I have only compared it to the raw file processing addition to Photoshop Elements and find it much superior. In addition to allowing adjustments to selected areas, one can also clone and heal areas of the photo. It does not eliminate the need for editors (like Photoshop, Paint Shop Pro) to complete editing, but it does provide capabilities which I am unable to do after conversion to jpg or tiff format.
Also, the cost is less than any of these three programs. It would be great to see how this less expensive software compares to the higher priced software.