freeware is not open source, nor is open source (at least its original definition) limited to freeware.
There may (or may not) be some tricks used in Giga Tiler that Kolor doesn't want to disclose. Or they may not want to support the source (even if they say "no support" people will still ask questions).
And besides, why use gigatiler when APT is available?
I didnt want to say thats freeware so where is the sourcecode...
I just want to say that a x years old freeware software still used and demanded does not get updated.
So if no interest from side kolor to develop or maintain exists then it perhaps could be positive for all if sourecode would be public...
PTP? I can here set the tilesize... But did you ever check the resulting tilesize? its almost always not the set value. kmaketiles from krpanotools does what you want, also giga tiler. One most desired feature for the gigatiler is the pasting the tiles back together to one pano... PTP cant do this today , even PTPs export of cubefaces to manipulate the tiles (nadir!) and reimport works, but the resulting pano cant be exported to a single image.... so for this a more enhanced (and Im hopeful after the AP2.5 release some focus on the gigatiler is coming from Kolor side) Gigatiler would be an important tool for working process...
PS: krpanotools are here not the optimum because the kmatetiles can only handle 8bit tiffs and jpgs
so this would be chance for the gigatiler to overtake if 16bit or also png .kro files would be accepted ;-)