https://hdrmaps.com/blog/autopano-giga-is-now-free/

Windows version (Windows 7, 8, 10, 11):

https://download.hdrmaps.com/AutopanoGiga_x64_442_2018-09-10.exe

MacOS version:

https://download.hdrmaps.com/AutopanoGiga_Mac_442_2018-09-10.dmg

Linux version (Debian, Ubuntu)

https://download.hdrmaps.com/AutopanoGiga_Linux64_442_2018-09-10.deb

Then, you need to enter the following registration details:

User: freecopy@kolor.com

Registration code: KAPG7-K3A9X-IZJHX-FIIT7-C5IM8-MQF2N

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On Linux I am using Hugin

https://hugin.sourceforge.io/