Good morning;
In the "third party manufacturers," the Tamron SP series, the Tokina ATX series, and the Vivitar S1 series, are probably the best known higher quality lens makers. There were some others, such as the Carl Zeiss lenses and the rare and very expensive Kilfitt, both of which are very good. The Tamron Adapt-A-Matic, Adaptall, and Adaptall-2 lens mounting systems meant that their lenses could be used on a wide range of older and new cameras. The fact that Tamron followed the thought of making a lens and selecting a lens mount to fit onto the back of the lens for use on many different cameras is not surprising. They were the ones who came up with the 42mm by 0.75mm thread "T-Mount" program back in the 1950s. Yes, that "T" in the name does stand for "Tamron" now, but originally it was "Taisei" or the Taisei Optical Manufacturing Industries back in the 1950s. Yes, that thread specification is close to the M-42 "Universal Thread Mount" (UTM) thread specification of 42mm by 1.0mm used by Contax, Pentax, Zenit, and many others, but it is not the same. Vivitar tried a similar interchangeable mount system with their "TX Mount" system, but it did not enjoy quite as much success. I believe that the Soligor people also made lenses that used the TX Mount system. Probably there are others.
While I have only one bespoke Canon lens for the Canon Pellix QL SLR camera here, there is a Canon FD Adaptall mount here also, so there is a collection of lenses that can go onto Pellix QL.
Enjoy, and Merry Christmas;
Ralph, Latte Land, Washington