The best open source alternative to PTgui is Hugin, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to PTgui and four of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to PTgui are Enblend/Enfuse (Free, Open Source), Stitch Panorama (Free, Open Source) and PTStitcherNG (Free, Open Source).
Hugin is an easy to use cross-platform panoramic imaging toolchain based on Panorama Tools. With Hugin you can assemble a mosaic of photographs into a complete impressive panorama, stitch any series of overlapping pictures and much more.i
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Most users think Hugin is a great alternative to PTgui.