CMSoft Stereoscopic Editor is an interesting free piece of software with a simple and easy to use interface that allows you to easily convert .MPO files to .JPS and as separate left/right stereo pairs, as well as doing some quick and simple adjustments to stereoscopic 3D photos. This editor has been developed for use on non-stereo 3D-capable displays and thus it only supports cross-eye and wiggle viewing methods for the 3D photo preview. You can also adjust parallax manually, although there is also an auto adjustment function that may not always provide the best results and there is the capability to use some basic filters such as Gaussian Blur for example with the ability to even create your own custom filters for the application if you are good with OpenCL programming.
CMSoft Stereoscopic Editor can open .MPO files from a 3D-capsble camera and import separate left and right views taken with dual camera setups and can directly and easily export them into single file .JPS stereo pairs or save them in separate .JPG left and right files. It also supports batch conversion of .MPO files, so no need to individually convert the files one by one, just have in mind that the Convert to MPO menu does not work with the currently opened file, but requires you to select the file or files you cant converted. I’ve had a bit of trouble with loading the OpenCL filters that are provided with the software, but other than that the program worked quite well, so it might turn out to be a handy tool for some of you. Of course it is not as powerful and as feature rich as the StereoPhoto Maker, but can be handy for some quick edits.