Stereo has many similarities with Hugin, the panorama stitcher. Both need to set corresponding points in overlapping images (Stereo for calibration and Hugin to align images for stiching). If you are interested in Stereo, you may also be interested in what Hugin can do.
A soft copy photogrammetry work station is provided by e-Foto. If you are using conventional air-photo stereo pairs, then e-Foto may be more useful to you.